CINXE.COM
The Physics Factbook - Topic Index
<!doctype html> <html lang="en" itemscope itemtype="https://schema.org/WebPage"> <head> <meta charset="utf-8"> <title>The Physics Factbook - Topic Index</title> <link rel="stylesheet" href="https://omniscientwalnut.com/walnut.css"> <link rel="stylesheet" href="https://omniscientwalnut.com/walpaper.css" media="print"> <link rel="stylesheet" href="https://omniscientwalnut.com/facts.css"> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- ORDINARY FACTS PAGES there are no extraordinary pages --> <!-- robots --> <!-- Я твой слуга. Я твой работник. --> <!-- author --> <link rel="author" href="https://glennelert.us"> <meta name="author" content="Glenn Elert"> <!-- break out of frames --> <script>if (window!= top) top.location.href=location.href</script> <!-- jQuery for scrolltop --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <!-- Google Structured Data https://developers.google.com/structured-data --> <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Organization", "name": "hypertextbook", "url": "https://hypertextbook.com", "logo": "https://omniscientwalnut.com/eglobe.png" } </script> <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "WebSite", "name": "The Physics Factbook", "url": "https://hypertextbook.com/facts/" } </script> <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Person", "name": "Glenn Elert", "description": "Author, illustrator, webmaster. Career science teacher. Citizen of the United States. Omniscient walnut.", "image": "https://glennelert.us/walnut.png", "url": "https://glennelert.us", "sameAs": [ "https://twitter.com/GlennElert", "https://www.youtube.com/user/fleenbert" ] } </script> <!-- hypertextbook icons --> <meta name="apple-mobile-web-app-title" content="hypertextbook"> <meta name="application-name" content="hypertextbook"> <meta name="msapplication-config" content="https://hypertextbook.com/hypertextbook/browserconfig.xml"> <meta name="msapplication-TileColor" content="#001f3d"> <meta name="theme-color" content="#ffffff"> <link rel="manifest" href="https://hypertextbook.com/hypertextbook/site.webmanifest"> <link rel="apple-touch-icon" href="https://hypertextbook.com/hypertextbook/apple-touch-icon.png" sizes="180x180"> <link rel="apple-touch-icon" href="https://hypertextbook.com/hypertextbook/apple-touch-icon-152x152.png" sizes="152x152"> <link rel="apple-touch-icon" href="https://hypertextbook.com/hypertextbook/apple-touch-icon-120x120.png" sizes="120x120"> <link rel="apple-touch-icon" href="https://hypertextbook.com/hypertextbook/apple-touch-icon-76x76.png" sizes="76x76"> <link rel="apple-touch-icon" href="https://hypertextbook.com/hypertextbook/apple-touch-icon-60x60.png" sizes="60x60"> <!-- shared icons --> <link rel="shortcut icon" href="https://hypertextbook.com/favicon.ico" sizes="64x64"> <link rel="shortcut icon" href="https://hypertextbook.com/favicon-48x48.ico" sizes="48x48"> <link rel="icon" href="https://hypertextbook.com/favicon-32x32.png" sizes="32x32" type="image/png"> <link rel="icon" href="https://hypertextbook.com/favicon-16x16.png" sizes="16x16" type="image/png"> <link rel="mask-icon" href="https://hypertextbook.com/safari-pinned-tab.svg" color="#001f3d"> <!-- InMobi Choice. Consent Manager Tag v3.0 (for TCF 2.2) --> <script type="text/javascript" async=true> (function() { var host = window.location.hostname; var element = document.createElement('script'); var firstScript = document.getElementsByTagName('script')[0]; var url = 'https://cmp.inmobi.com' .concat('/choice/', '2cH8w1NPvzsTT', '/', host, '/choice.js?tag_version=V3'); var uspTries = 0; var uspTriesLimit = 3; element.async = true; element.type = 'text/javascript'; element.src = url; firstScript.parentNode.insertBefore(element, firstScript); function makeStub() { var TCF_LOCATOR_NAME = '__tcfapiLocator'; var queue = []; var win = window; var cmpFrame; function addFrame() { var doc = win.document; var otherCMP = !!(win.frames[TCF_LOCATOR_NAME]); if (!otherCMP) { if (doc.body) { var iframe = doc.createElement('iframe'); iframe.style.cssText = 'display:none'; iframe.name = TCF_LOCATOR_NAME; doc.body.appendChild(iframe); } else { setTimeout(addFrame, 5); } } return !otherCMP; } function tcfAPIHandler() { var gdprApplies; var args = arguments; if (!args.length) { return queue; } else if (args[0] === 'setGdprApplies') { if ( args.length > 3 && args[2] === 2 && typeof args[3] === 'boolean' ) { gdprApplies = args[3]; if (typeof args[2] === 'function') { args[2]('set', true); } } } else if (args[0] === 'ping') { var retr = { gdprApplies: gdprApplies, cmpLoaded: false, cmpStatus: 'stub' }; if (typeof args[2] === 'function') { args[2](retr); } } else { if(args[0] === 'init' && typeof args[3] === 'object') { args[3] = Object.assign(args[3], { tag_version: 'V3' }); } queue.push(args); } } function postMessageEventHandler(event) { var msgIsString = typeof event.data === 'string'; var json = {}; try { if (msgIsString) { json = JSON.parse(event.data); } else { json = event.data; } } catch (ignore) {} var payload = json.__tcfapiCall; if (payload) { window.__tcfapi( payload.command, payload.version, function(retValue, success) { var returnMsg = { __tcfapiReturn: { returnValue: retValue, success: success, callId: payload.callId } }; if (msgIsString) { returnMsg = JSON.stringify(returnMsg); } if (event && event.source && event.source.postMessage) { event.source.postMessage(returnMsg, '*'); } }, payload.parameter ); } } while (win) { try { if (win.frames[TCF_LOCATOR_NAME]) { cmpFrame = win; break; } } catch (ignore) {} if (win === window.top) { break; } win = win.parent; } if (!cmpFrame) { addFrame(); win.__tcfapi = tcfAPIHandler; win.addEventListener('message', postMessageEventHandler, false); } }; makeStub(); var uspStubFunction = function() { var arg = arguments; if (typeof window.__uspapi !== uspStubFunction) { setTimeout(function() { if (typeof window.__uspapi !== 'undefined') { window.__uspapi.apply(window.__uspapi, arg); } }, 500); } }; var checkIfUspIsReady = function() { uspTries++; if (window.__uspapi === uspStubFunction && uspTries < uspTriesLimit) { console.warn('USP is not accessible'); } else { clearInterval(uspInterval); } }; if (typeof window.__uspapi === 'undefined') { window.__uspapi = uspStubFunction; var uspInterval = setInterval(checkIfUspIsReady, 6000); } })(); </script> <!-- End InMobi Choice. Consent Manager Tag v3.0 (for TCF 2.2) --> <!-- ShareThis --> <script type='text/javascript' src='https://platform-api.sharethis.com/js/sharethis.js#property=64432e98e412510019625a9d&product=sop' async='async'></script> <!-- Global global site tag (gtag.js) --> <script async src="https://www.googletagmanager.com/gtag/js?id=G-QCX5P85WEL"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-QCX5P85WEL'); </script> <!-- Google Search --> <script> (function() { var cx = '010156806650563000082:chk_tobzrhs'; var gcse = document.createElement('script'); gcse.type = 'text/javascript'; gcse.async = true; gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') + '//cse.google.com/cse.js?cx=' + cx; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(gcse, s); })(); </script> </head> <body> <header> <nav><ul><li title="The Chaos Hypertextbook Mathematics in the age of the computer"><a href="https://hypertextbook.com/chaos/" target="_top">chaos</a></li><li title="E-World Articles, essays, ideas, opinions, unabridged"><a href="https://hypertextbook.com/eworld/" target="_top">eworld</a></li><li title="The Physics Factbook An encyclopedia of scientific essays" class="selected"><a href="https://hypertextbook.com/facts/" target="_top">facts</a></li><li title="Get Bent Coast to coast by recumbent bicycle"><a href="https://hypertextbook.com/bent/" target="_top">get bent</a></li><li title="The Physics Hypertextbook A work in progress"><a href="https://physics.info" target="_top">physics</a></li></ul></nav> <div class="title" title="The Physics Factbook"> <a href="https://hypertextbook.com/facts/" target="_top">The Physics<br>Factbook</a> </div> <div class="subtitle" title="An educational, fair use website"> <a href="https://hypertextbook.com/facts/about/" target="_top">An encyclopedia of scientific essays</a> </div> <nav> <ul> <li><a href="https://hypertextbook.com/facts/about/" target="_top" title="News, About, Links">prefaces</a></li> <li><a href="https://hypertextbook.com/facts/" target="_top" title="Topic Index">topics</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml" target="_top" title="Author Index">authors</a></li> <li><a href="https://hypertextbook.com/facts/index-special.shtml" target="_top" title="Special Projects">special</a></li> <li><a href="https://hypertextbook.com/facts/about/instructions.shtml" target="_top" title="Instructions to Students">instructions</a></li> </ul> </nav> </header> <article id="foreheadless"> <header> <h1>Topic Index</h1> <p style="margin: 1.38em auto;">An educational, <a href="https://hypertextbook.com/facts/about/fairuse.shtml" title="United States Copyright Act of 1976 §107. Limitations on Exclusive Rights: Fair Use">fair use</a> website</p> <div class="add add-yes"><div class="sharethis-inline-share-buttons"></div><span class="add-goo"><a href="#search"><img src="https://omniscientwalnut.com/search.svg" alt="search icon" title="Search this site"></a></span></div><div id="search" class="overlay"><div class="popup shadow"><a class="close" href="#" title="Close this window">[close]</a><div class="gcse-searchbox-only"></div></div></div> </header> <section id="discussion"> <nav> <p> <a href="#acceleration"><span class="tight">acceleration</span><span class="loose"><i>a</i></span></a>, <a href="#angularvelocity"><span class="tight">angular‑velocity</span><span class="loose">ω</span></a>, <a href="#area"><span class="tight">area</span><span class="loose"><i>A</i></span></a>, <a href="#density"><span class="tight">density</span><span class="loose">ρ</span></a>, <a href="#dimension"><span class="tight">dimension</span><span class="loose"><i>D</i></span></a>, <a href="#current"><span class="tight">electric‑current</span><span class="loose"><i>I</i></span></a>, <a href="#efield"><span class="tight">electric‑field</span><span class="loose"><i>E</i></span></a>, <a href="#voltage"><span class="tight">electric‑voltage</span><span class="loose"><i>V</i></span></a>, <a href="#resistivity"><span class="tight">electrical‑resistivity</span><span class="loose">ρ</span></a>, <a href="#energy"><span class="tight">energy</span><span class="loose"><i>E</i></span></a>, <a href="#force"><span class="tight">force</span><span class="loose"><i>F</i></span></a>, <a href="#frequency"><span class="tight">frequency</span><span class="loose"><i>f</i></span></a>, <a href="#friction"><span class="tight">friction</span><span class="loose">μ</span></a>, <a href="#length"><span class="tight">length</span><span class="loose">ℓ</span></a>, <a href="#bfield"><span class="tight">magnetic‑field</span><span class="loose"><i>B</i></span></a>, <a href="#mass"><span class="tight">mass</span><span class="loose"><i>m</i></span></a>, <a href="#money"><span class="tight">money</span><span class="loose">$</span></a>, <a href="#number"><span class="tight">number</span><span class="loose">#</span></a>, <a href="#power"><span class="tight">power</span><span class="loose"><i>P</i></span></a>, <a href="#pressure"><span class="tight">pressure</span><span class="loose"><i>p</i></span></a>, <a href="#index"><span class="tight">refraction</span><span class="loose"><i>n</i></span></a>, <a href="#cor"><span class="tight">restitution</span><span class="loose"><i>cor</i></span></a>, <a href="#temperature"><span class="tight">temperature</span><span class="loose"><i>T</i></span></a>, <a href="#time"><span class="tight">time</span><span class="loose"><i>t</i></span></a>, <a href="#velocity"><span class="tight">velocity</span><span class="loose"><i>v</i></span></a>, <a href="#volume"><span class="tight">volume</span><span class="loose"><i>V</i></span></a> </p> </nav> <nav> <p>* entries marked with an asterisk include editor's commentary</p> <ol> <li><h2><a id="acceleration"></a>Acceleration (Acceleration Due To Gravity)</h2> <ol> <li><a href="https://hypertextbook.com/facts/2005/accelerometer.shtml">Acceleration perturbations of daily living</a></li> <li><a href="https://hypertextbook.com/facts/2006/accelerometer.shtml">More acceleration perturbations of daily living</a></li> <li><a href="https://hypertextbook.com/facts/2001/MeredithBarricella.shtml">Acceleration of a car</a></li> <li><a href="https://hypertextbook.com/facts/2007/AnamAhmed.shtml">Acceleration of a dragster</a></li> <li><a href="https://hypertextbook.com/facts/2009/AmosBaptiste.shtml">Acceleration of an elevator, cable</a></li> <li><a href="https://hypertextbook.com/facts/2005/elevator.shtml">Acceleration of an elevator, hydraulic</a></li> <li><a href="https://hypertextbook.com/facts/2006/SaintedymWills.shtml">Acceleration of a roller coaster</a></li> <li><a href="https://hypertextbook.com/facts/2000/JeffreyAnthony.shtml">Acceleration of a manned rocket</a>*</li> <li><a href="https://hypertextbook.com/facts/1998/PhillipAndriyevsky.shtml">Acceleration of blackout in fighter pilots</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/NikkieZanevsky.shtml">Acceleration in a training centrifuge</a></li> <li><a href="https://hypertextbook.com/facts/2008/ElinaSlobod.shtml">Acceleration of a medical centrifuge</a></li> <li><a href="https://hypertextbook.com/facts/2003/MichelleYee.shtml">Acceleration that would deploy car airbags</a></li> <li>Acceleration that would break human bones</li> <li><a href="https://hypertextbook.com/facts/2004/YuriyRafailov.shtml">Acceleration that would kill a human</a></li> <li>Acceleration of a cannonball</li> <li><a href="https://hypertextbook.com/facts/2003/MichaelTse.shtml">Acceleration of a bullet</a></li> <li>Acceleration due to gravity at New York City</li> <li>Acceleration due to gravity at Quito, Ecuador</li> <li><a href="https://hypertextbook.com/facts/2004/MichaelRobbins.shtml">Acceleration due to gravity on the moon</a></li> <li><a href="https://hypertextbook.com/facts/2004/JahshirahRossi.shtml">Acceleration due to gravity on Mars</a></li> <li><a href="https://hypertextbook.com/facts/2007/mariogravity.shtml">Acceleration due to gravity: Super Mario Brothers</a></li> </ol> </li> <li><h2><a id="angularvelocity"></a>Angular Velocity (Angular Speed)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2002/JasonAtkins.shtml">Angular speed of the earth</a></li> <li><a href="https://hypertextbook.com/facts/2000/AlexandraGrosman.shtml">Angular speed of a phonograph record</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/GennaAbleman.shtml">Angular speed of a floppy disk</a></li> <li><a href="https://hypertextbook.com/facts/2007/SimonChen.shtml">Angular speed of a hard disk drive</a></li> <li><a href="https://hypertextbook.com/facts/2000/LawrenceFung.shtml">Angular speed of a CD</a></li> <li><a href="https://hypertextbook.com/facts/2003/ClerbieMontilus.shtml">Angular speed of a DVD</a></li> <li>Angular speed of a car engine</li> <li>Angular speed of a truck engine</li> <li>Angular speed of a jet turbine</li> <li><a href="https://hypertextbook.com/facts/2003/LanaPustilnikova.shtml">Angular speed of a training centrifuge</a></li> <li><a href="https://hypertextbook.com/facts/1999/ArikaBryant.shtml">Angular speed of a medical centrifuge</a></li> <li>Angular speed of a kitchen blender</li> </ol> </li> <li> <h2><a id="area"></a>Area (Surface Area)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li>Area of a ping pong paddle</li> <li>Area of a badminton racket</li> <li>Area of a tennis racket</li> <li><a href="https://hypertextbook.com/facts/2009/StephanieHeyligar.shtml">Area of a ping pong table</a></li> <li><a href="https://hypertextbook.com/facts/2009/AmyHuang.shtml">Area of a tennis court</a></li> <li>Area of a basketball court</li> <li>Area of a football field (soccer pitch)</li> <li>Area of a football field (American)</li> <li>Area of a football field (Canadian)</li> <li><a href="https://hypertextbook.com/facts/2009/XuewenLiang.shtml">Area of a baseball field</a></li> <li>Area of a newspaper</li> <li><a href="https://hypertextbook.com/facts/2000/AtiyaDixon.shtml">Area of Manhattan</a></li> <li><a href="https://hypertextbook.com/facts/2002/StanVinokur.shtml">Area of Brooklyn</a></li> <li><a href="https://hypertextbook.com/facts/2002/JordanLevine1.shtml">Area of New York City</a></li> <li><a href="https://hypertextbook.com/facts/2000/SamanthaDong1.shtml">Area of New York State</a></li> <li><a href="https://hypertextbook.com/facts/2000/JulieChen.shtml">Area of the polar ice caps</a></li> <li><a href="https://hypertextbook.com/facts/2001/DanielChen.shtml">Area of earth's land surface</a></li> <li><a href="https://hypertextbook.com/facts/1997/EricCheng.shtml">Area of earth's oceans</a></li> <li><a href="https://hypertextbook.com/facts/2001/IgorFridman.shtml">Surface area of human skin</a></li> </ol> </li> <li> <h2><a id="density"></a>Density (Specific Gravity)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2000/ChristinaCheng.shtml">Density of the universe</a></li> <li><a href="https://hypertextbook.com/facts/2000/DaWeiCai.shtml">Density of outer space</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/RandyAbbas.shtml">Density of the solar wind</a></li> <li><a href="https://hypertextbook.com/facts/1999/MesahHarwood.shtml">Density of the best laboratory vacuum</a></li> <li><a href="https://hypertextbook.com/facts/2000/RachelChu.shtml">Density of air</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/AlexDallas.shtml">Density of ice</a></li> <li><a href="https://hypertextbook.com/facts/2007/AllenMa.shtml">Density of water</a></li> <li><a href="https://hypertextbook.com/facts/2007/DmitriyGekhman.shtml">Density of steam</a></li> <li><a href="https://hypertextbook.com/facts/2002/EdwardLaValley.shtml">Density of sea water</a></li> <li><a href="https://hypertextbook.com/facts/2004/MichaelShmukler.shtml">Density of blood</a></li> <li><a href="https://hypertextbook.com/facts/2002/AliciaNoelleJones.shtml">Density of milk</a></li> <li><a href="https://hypertextbook.com/facts/2000/BlairElefant.shtml">Density of beer</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/IngaDorfman.shtml">Density of cooking oil</a></li> <li><a href="https://hypertextbook.com/facts/2007/ArtemGindin.shtml">Density of petroleum</a></li> <li><a href="https://hypertextbook.com/facts/2005/VirginiaAllard.shtml">Density of soap</a></li> <li><a href="https://hypertextbook.com/facts/2002/AnnaYarusskaya.shtml">Density of bone</a></li> <li><a href="https://hypertextbook.com/facts/2000/ShirleyLam.shtml">Density of wood</a></li> <li>Density of a Space Shuttle tile</li> <li><a href="https://hypertextbook.com/facts/1999/KatrinaJones.shtml">Density of concrete</a>*</li> <li><a href="https://hypertextbook.com/facts/2004/ShayeStorm.shtml">Density of glass</a></li> <li><a href="https://hypertextbook.com/facts/2004/KarenSutherland.shtml">Density of steel</a></li> <li><a href="https://hypertextbook.com/facts/2004/RuwanMeepagala.shtml">Density of gold</a></li> <li><a href="https://hypertextbook.com/facts/2004/OliviaTai.shtml">Density of platinum</a></li> <li><a href="https://hypertextbook.com/facts/2004/HayleyMiskiewicz.shtml">Density of plutonium</a>*</li> <li><a href="https://hypertextbook.com/facts/2006/MichaelMirochnik.shtml">Density of uranium</a></li> <li><a href="https://hypertextbook.com/facts/2007/KarmenHo.shtml">Density of osmium</a></li> <li><a href="https://hypertextbook.com/facts/2000/KatherineMalfucci.shtml">Density of the earth</a></li> <li><a href="https://hypertextbook.com/facts/1997/MeredithGarmisa.shtml">Density of Saturn</a></li> <li><a href="https://hypertextbook.com/facts/1999/MayKo.shtml">Density of the sun</a></li> <li><a href="https://hypertextbook.com/facts/1996/MichaelErber.shtml">Density of a white dwarf star</a></li> <li><a href="https://hypertextbook.com/facts/1998/AnthonyColgan.shtml">Density of a neutron star</a></li> </ol> </li> <li> <h2><a id="dimension"></a>Dimension (Fractal Dimension)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2002/bread.shtml">Fractal dimension of bread</a></li> <li><a href="https://hypertextbook.com/facts/2002/broccoli.shtml">Fractal dimension of broccoli</a></li> <li><a href="https://hypertextbook.com/facts/2002/maine.shtml">Fractal dimension of the coast of Maine</a></li> <li><a href="https://hypertextbook.com/facts/2002/leaves.shtml">Fractal dimension of leaves</a></li> <li><a href="https://hypertextbook.com/facts/2002/stocks.shtml">Fractal dimension of stock price changes</a></li> </ol> </li> <li> <h2><a id="current"></a>Electric Current<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2001/WilliamCruz.shtml">Electric current from a 1.5 V battery</a></li> <li><a href="https://hypertextbook.com/facts/2000/AronFisch.shtml">Electric current from a car battery</a></li> <li><a href="https://hypertextbook.com/facts/2004/LindseyTannenbaum.shtml">Electric current through a microwave oven</a></li> <li>Electric current through a refrigerator</li> <li><a href="https://hypertextbook.com/facts/2003/KevinRoman.shtml">Electric current through an air conditioner</a></li> <li>Electric current through an electric stove</li> <li><a href="https://hypertextbook.com/facts/2004/ChiemezieOsu.shtml">Electric current through a home</a></li> <li>Electric current through an arc welder<span class="tight"> [not MIG or TIG]</span></li> <li><a href="https://hypertextbook.com/facts/2003/PokiLi.shtml">Electric current through a MIG welder</a></li> <li><a href="https://hypertextbook.com/facts/2003/JolaLewinski.shtml">Electric current through a TIG welder</a></li> <li>Electric current through an arc furnace</li> <li><a href="https://hypertextbook.com/facts/2000/SunnyFeng.shtml">Electric current from an electric eel</a></li> <li><a href="https://hypertextbook.com/facts/2004/LukeWorkoff.shtml">Electric current of a stun gun</a></li> <li><a href="https://hypertextbook.com/facts/2004/MarieYacoub.shtml">Electric current used in electroshock therapy</a></li> <li><a href="https://hypertextbook.com/facts/2000/JackHsu.shtml">Electric current needed to kill a human</a></li> <li><a href="https://hypertextbook.com/facts/1998/AprilDunetz.shtml">Electric current through an electric chair</a>*</li> <li><a href="https://hypertextbook.com/facts/1997/BrookeHaramija.shtml">Electric current through a lightning bolt</a></li> <li><a href="https://hypertextbook.com/facts/2006/TerryMathew.shtml">Electric current through the atmosphere</a></li> </ol> </li> <li> <h2><a id="efield"></a>Electric Field (Dielectric Strength)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2000/AliceHong.shtml">Dielectric strength of air</a></li> <li>Dielectric strength of glass, crown</li> <li>Dielectric strength of glass, pyrex (borosilicate glass)</li> <li>Dielectric strength of mica</li> <li>Dielectric strength of silicone</li> <li>Dielectric strength of transformer oil</li> <li><a href="https://hypertextbook.com/facts/2007/VashtiPrasad.shtml">Dielectric strength of paper</a></li> <li><a href="https://hypertextbook.com/facts/2009/CherryXu.shtml">Dielectric strength of polyethylene</a></li> <li>Dielectric strength of polypropylene</li> <li><a href="https://hypertextbook.com/facts/2008/JeffreyWong.shtml">Dielectric strength of fused quartz</a></li> <li><a href="https://hypertextbook.com/facts/2007/DashaMulyukova.shtml">Dielectric strength of waxed paper</a></li> <li>Dielectric strength of air</li> <li><a href="https://hypertextbook.com/facts/2001/LisaChan.shtml">Electric field inside a typical US home</a></li> <li><a href="https://hypertextbook.com/facts/2003/VictorLee.shtml">Electric field near a cellular telephone</a></li> <li><a href="https://hypertextbook.com/facts/1998/TreshaEdwards.shtml">Electric field on earth</a>*</li> <li>Electric field on the sun</li> </ol> </li> <li> <h2><a id="voltage"></a>Electric Potential (Electromotive Force, Potential Difference, Voltage)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2001/AliceLi.shtml">Voltage of an alkaline battery</a></li> <li><a href="https://hypertextbook.com/facts/2001/AlanLeung.shtml">Voltage of a nickel metal hydride battery</a></li> <li><a href="https://hypertextbook.com/facts/2001/JohnnyLee.shtml">Voltage of a nickel cadmium battery</a></li> <li><a href="https://hypertextbook.com/facts/2001/ThiMeaganLe.shtml">Voltage of a car battery</a></li> <li>Voltage of a truck battery</li> <li><a href="https://hypertextbook.com/facts/1999/SamaraMartinez.shtml">Voltage of household electrical outlets</a></li> <li><a href="https://hypertextbook.com/facts/2003/KarryLai.shtml">Voltage of a fluorescent tube</a></li> <li><a href="https://hypertextbook.com/facts/2004/PhilipYeung.shtml">Voltage of a neon light</a></li> <li><a href="https://hypertextbook.com/facts/2005/DorothySoo.shtml">Voltage of a mercury light</a></li> <li>Voltage of a sodium vapor light</li> <li><a href="https://hypertextbook.com/facts/2000/MichelleHong.shtml">Voltage of a television picture tube</a></li> <li><a href="https://hypertextbook.com/facts/1999/DeniseLai.shtml">Voltage of automobile spark plugs</a></li> <li><a href="https://hypertextbook.com/facts/1999/BarryLajnwand.shtml">Voltage of an electric eel</a></li> <li><a href="https://hypertextbook.com/facts/2001/NicoleCastellano.shtml">Voltage of an electric fence</a></li> <li><a href="https://hypertextbook.com/facts/2001/SabrinaKhan.shtml">Voltage of an electron microscope</a></li> <li><a href="https://hypertextbook.com/facts/2001/YanaNisanov1.shtml">Voltage of a nerve cell</a></li> <li><a href="https://hypertextbook.com/facts/2002/JonathanHamill1.shtml">Voltage of a stun gun</a></li> <li><a href="https://hypertextbook.com/facts/2005/GinaCastellano.shtml">Voltage of electroshock therapy</a></li> <li><a href="https://hypertextbook.com/facts/1999/CindyAnnRomanowich.shtml">Voltage used to resuscitate a human heart</a></li> <li><a href="https://hypertextbook.com/facts/1996/NancyRyan.shtml">Voltage of an electric chair</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/AlexRyabov.shtml">Voltage of power transmission lines</a></li> <li><a href="https://hypertextbook.com/facts/1998/MathieuLo.shtml">Voltage of a lightning bolt</a></li> </ol> </li> <li> <h2><a id="resistivity"></a>Electrical Resistivity (Reciprocal of Electrical Conductivity)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2004/ValPolyakov.shtml">Resistivity of aluminum</a></li> <li><a href="https://hypertextbook.com/facts/2006/EuniceHuang.shtml">Resistivity of aluminum oxide</a></li> <li><a href="https://hypertextbook.com/facts/2007/DanaKlavansky.shtml">Resistivity of carbon, amorphous</a></li> <li><a href="https://hypertextbook.com/facts/2004/KerryRemulla.shtml">Resistivity of carbon, diamond</a></li> <li><a href="https://hypertextbook.com/facts/2004/AfricaBelgrave.shtml">Resistivity of carbon, graphite</a></li> <li><a href="https://hypertextbook.com/facts/2004/BridgetRitter.shtml">Resistivity of copper</a></li> <li><a href="https://hypertextbook.com/facts/2004/JaneGolubovskaya.shtml">Resistivity of glass</a></li> <li><a href="https://hypertextbook.com/facts/2004/StanleyKo.shtml">Resistivity of germanium</a></li> <li><a href="https://hypertextbook.com/facts/2004/JennelleBaptiste.shtml">Resistivity of gold</a></li> <li><a href="https://hypertextbook.com/facts/2004/JonathanRuditser.shtml">Resistivity of iron</a></li> <li><a href="https://hypertextbook.com/facts/2006/MarinaGrintsvayg.shtml">Resistivity of mercury</a></li> <li>Resistivity of mica</li> <li><a href="https://hypertextbook.com/facts/2007/HarveyKwan.shtml">Resistivity of nichrome</a></li> <li><a href="https://hypertextbook.com/facts/2004/JenniferSchanke.shtml">Resistivity of quartz</a></li> <li>Resistivity of silicon</li> <li><a href="https://hypertextbook.com/facts/2004/GeorgeBauer.shtml">Resistivity of silver</a></li> <li><a href="https://hypertextbook.com/facts/2006/UmranUgur.shtml">Resistivity of steel</a></li> <li><a href="https://hypertextbook.com/facts/2004/DeannaStewart.shtml">Resistivity of tungsten</a></li> <li><a href="https://hypertextbook.com/facts/2006/SamTetruashvili.shtml">Resistivity of water, distilled</a></li> <li>Resistivity of water, seawater</li> <li><a href="https://hypertextbook.com/facts/2007/resistors.shtml">Resistance of a resistor: Blame the students or blame the resistors</a>?</li> </ol> </li> <li> <h2><a id="energy"></a>Energy (Energy Density)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2000/AmberIqbal.shtml">Energy in ATP</a></li> <li>Energy of the most extreme cosmic rays</li> <li><a href="https://hypertextbook.com/facts/1999/JonathanStarr.shtml">Energy of the most extreme gamma rays</a></li> <li><a href="https://hypertextbook.com/facts/2009/VickieWu.shtml">Energy consumption of a human</a></li> <li><a href="https://hypertextbook.com/facts/2001/KhalidaNisimova.shtml">Energy of a 1.5 V battery</a></li> <li><a href="https://hypertextbook.com/facts/2002/RaymondTran.shtml">Energy of a car battery</a></li> <li><a href="https://hypertextbook.com/facts/2006/SzeYinTam.shtml">Energy of a truck battery</a></li> <li><a href="https://hypertextbook.com/facts/2002/JanyTran.shtml">Energy in a cubic meter of natural gas</a></li> <li><a href="https://hypertextbook.com/facts/2009/BennyWong.shtml">Energy in a barrel of petroleum</a></li> <li><a href="https://hypertextbook.com/facts/2006/LunChen.shtml">Energy in a ton of coal</a></li> <li><a href="https://hypertextbook.com/facts/2002/AlexRoslyakov.shtml">Energy in a ton of TNT</a></li> <li><a href="https://hypertextbook.com/facts/2000/MuhammadKaleem.shtml">Energy of a nuclear explosion</a>*</li> <li>Energy consumption of New York City</li> <li><a href="https://hypertextbook.com/facts/1998/JimmySeto.shtml">Energy consumption of China</a></li> <li><a href="https://hypertextbook.com/facts/1998/TommyZhou.shtml">Energy consumption of the United States</a></li> <li><a href="https://hypertextbook.com/facts/2003/WinnieHuang.shtml">Energy consumption of Africa</a></li> <li><a href="https://hypertextbook.com/facts/1998/JamesMcMahon.shtml">Energy consumption of Asia</a></li> <li><a href="https://hypertextbook.com/facts/2000/AlexKerzhner.shtml">Energy consumption of Australia</a></li> <li><a href="https://hypertextbook.com/facts/1998/MarvinRusinek.shtml">Energy consumption of Europe</a></li> <li><a href="https://hypertextbook.com/facts/1999/AlexBershadskiy.shtml">Energy consumption of North America</a></li> <li><a href="https://hypertextbook.com/facts/1998/AlexShikhman.shtml">Energy consumption of South America</a></li> <li>Energy consumption of the earth</li> <li><a href="https://hypertextbook.com/facts/2005/MichelleFung.shtml">Energy density of hydrogen</a></li> <li><a href="https://hypertextbook.com/facts/2004/BillyWan.shtml">Energy density of methane</a></li> <li><a href="https://hypertextbook.com/facts/2002/EricLeung.shtml">Energy density of propane</a></li> <li><a href="https://hypertextbook.com/facts/2004/NicoleWeathers.shtml">Energy density of butane</a></li> <li><a href="https://hypertextbook.com/facts/2003/ArthurGolnik.shtml">Energy density of gasoline</a></li> <li>Energy density of kerosene</li> <li><a href="https://hypertextbook.com/facts/2003/EvelynGofman.shtml">Energy density of aviation fuel</a></li> <li><a href="https://hypertextbook.com/facts/2006/TatyanaNektalova.shtml">Energy density of diesel fuel</a></li> <li>Energy density of heating oil</li> <li><a href="https://hypertextbook.com/facts/2005/JennyHua.shtml">Energy density of methanol (wood alcohol)</a></li> <li><a href="https://hypertextbook.com/facts/2003/RoxanneGarcia.shtml">Energy density of ethanol</a></li> <li><a href="https://hypertextbook.com/facts/2002/KarolShepelsky.shtml">Energy density of petroleum</a></li> <li><a href="https://hypertextbook.com/facts/2004/JessicaYan.shtml">Energy density of natural gas</a></li> <li>Energy density of wood</li> <li><a href="https://hypertextbook.com/facts/2003/JuliyaFisher.shtml">Energy density of coal</a></li> <li><a href="https://hypertextbook.com/facts/2007/AnuragPanda.shtml">Energy density of carbohydrates</a></li> <li><a href="https://hypertextbook.com/facts/2004/PingZhang.shtml">Energy density of fats</a></li> <li><a href="https://hypertextbook.com/facts/2003/DavidDukhan.shtml">Energy density of protein</a></li> </ol> </li> <li> <h2><a id="force"></a>Force (Tension, Thrust, Weight)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2009/ShirleyMei.shtml">Force on a microelectromechanical system (MEMS)</a></li> <li><a href="https://hypertextbook.com/facts/2007/slamdunk.shtml">Force of a windmill slam dunk: Vince Carter</a></li> <li><a href="https://hypertextbook.com/facts/2007/windmilldunk.shtml">Force of a windmill slam dunk: Dominique Wilkins</a></li> <li><a href="https://hypertextbook.com/facts/1999/SaraBirnbaum.shtml">Force on a runner's foot</a></li> <li><a href="https://hypertextbook.com/facts/2000/AlbertKlyachko.shtml">Force of a bat on a baseball</a></li> <li>Force of a tennis racket on a tennis ball</li> <li><a href="https://hypertextbook.com/facts/2001/EmilyAccamando.shtml">Force of a golf club on a golf ball</a></li> <li><a href="https://hypertextbook.com/facts/2007/superman.shtml">Force of a superhero: Superman Returns</a></li> <li><a href="https://hypertextbook.com/facts/2004/ElizabethEng.shtml">Tension of power transmission (high tension) lines</a></li> <li><a href="https://hypertextbook.com/facts/2005/SpiderMan.shtml">Tension in Spider-Man's webs</a></li> <li><a href="https://hypertextbook.com/facts/2004/WaiWingLeung.shtml">Things that weigh a newton</a></li> <li><a href="https://hypertextbook.com/facts/2000/KennethKwan.shtml">Thrust of a jet engine</a></li> <li><a href="https://hypertextbook.com/facts/1998/ColinLew.shtml">Thrust of a space shuttle</a></li> <li><a href="https://hypertextbook.com/facts/2009/AliciaMcGeachy.shtml">Weight of an apple</a></li> </ol> </li> <li> <h2><a id="friction"></a>Friction (Coefficient of Friction)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2005/aluminum.shtml">Coefficients of friction for aluminum</a></li> <li><a href="https://hypertextbook.com/facts/2006/MatthewMichaels.shtml">Coefficients of friction for concrete</a></li> <li><a href="https://hypertextbook.com/facts/2005/glass.shtml">Coefficients of friction for glass</a></li> <li><a href="https://hypertextbook.com/facts/2004/NinaChen.shtml">Coefficients of friction for graphite</a></li> <li><a href="https://hypertextbook.com/facts/2005/granite.shtml">Coefficients of friction for granite</a></li> <li><a href="https://hypertextbook.com/facts/2007/ConnieQiu.shtml">Coefficients of friction for human joints</a></li> <li><a href="https://hypertextbook.com/facts/2005/skin.shtml">Coefficients of friction for human skin</a></li> <li><a href="https://hypertextbook.com/facts/2007/hulk.shtml">Coefficient of friction for skin: The Incredible Hulk</a></li> <li><a href="https://hypertextbook.com/facts/2004/GennaAbleman.shtml">Coefficients of friction for ice</a></li> <li><a href="https://hypertextbook.com/facts/2005/paper.shtml">Coefficients of friction for paper</a></li> <li><a href="https://hypertextbook.com/facts/2005/rubber.shtml">Coefficients of friction for rubber</a></li> <li><a href="https://hypertextbook.com/facts/2007/TabraizRasul.shtml">Coefficients of friction for snow</a></li> <li><a href="https://hypertextbook.com/facts/2005/steel.shtml">Coefficients of friction for steel</a></li> <li><a href="https://hypertextbook.com/facts/2004/GarvinTam.shtml">Coefficients of friction for teflon</a></li> <li><a href="https://hypertextbook.com/facts/2005/wood.shtml">Coefficients of friction for wood</a></li> </ol> </li> <li> <h2><a id="frequency"></a>Frequency<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2003/DanielleDaly.shtml">Frequency of middle C</a></li> <li><a href="https://hypertextbook.com/facts/1998/ArsheAhmed.shtml">Frequency of a beating heart</a></li> <li><a href="https://hypertextbook.com/facts/2004/SamanthaCharles.shtml">Frequency of brain waves</a></li> <li><a href="https://hypertextbook.com/facts/1999/MichelleFinnegan.shtml">Frequency of bee wings</a></li> <li><a href="https://hypertextbook.com/facts/2000/NancyLee.shtml">Frequency of fly wings</a></li> <li><a href="https://hypertextbook.com/facts/2000/DianaLeung.shtml">Frequency of mosquito wings</a></li> <li><a href="https://hypertextbook.com/facts/2000/MarkLevin.shtml">Frequency of hummingbird wings</a></li> <li><a href="https://hypertextbook.com/facts/2006/LevMazniker.shtml">Frequency of a cat's purr</a></li> <li><a href="https://hypertextbook.com/facts/1996/RebeccaErber.shtml">Frequency of dolphin sonar</a></li> <li><a href="https://hypertextbook.com/facts/1998/JuanCancel.shtml">Frequency of bat sonar</a></li> <li><a href="https://hypertextbook.com/facts/2003/ChrisDAmbrose.shtml">Frequency range of human hearing</a></li> <li><a href="https://hypertextbook.com/facts/2003/TimCondon.shtml">Frequency range of dog hearing</a></li> <li><a href="https://hypertextbook.com/facts/2004/ChanMaung.shtml">Frequency used in ultrasonic cleaning</a></li> <li><a href="https://hypertextbook.com/facts/1999/BorisZolotaryov.shtml">Frequency used in ultrasonic imaging</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/EmranYusufov.shtml">Frequency used in navigational sonar</a></li> <li><a href="https://hypertextbook.com/facts/2001/LisaWu.shtml">Frequency of ELF transmissions</a></li> <li><a href="https://hypertextbook.com/facts/2004/HeatherFriedberg.shtml">Frequency of cosmic microwave background</a></li> <li><a href="https://hypertextbook.com/facts/1998/HowardCheung.shtml">Frequency of a microwave oven</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/MaxLipkin.shtml">Frequency of a police radar gun</a></li> <li><a href="https://hypertextbook.com/facts/2001/ElizabethWong.shtml">Frequency of the lowest electromagnetic waves</a></li> <li><a href="https://hypertextbook.com/facts/2000/ElaineLo.shtml">Frequency of the highest electromagnetic waves</a></li> </ol> </li> <li> <h2><a id="length"></a>Length (Altitude, Center of Mass, Depth, Diameter, Distance, Focal Length, Height, Range, Resolution, Size, Thickness, Wavelength)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li>Altitude of highest permanent human habitation</li> <li><a href="https://hypertextbook.com/facts/2005/MoniqueAnthony.shtml">Altitude of human survivability, maximum<span class="tight"> [vertical limit]</span></a></li> <li><a href="https://hypertextbook.com/facts/2000/SanjeevMenon.shtml">Altitude of the lowest point on earth</a></li> <li><a href="https://hypertextbook.com/facts/2001/ChristinaWong.shtml">Altitude of the highest point on earth</a></li> <li><a href="https://hypertextbook.com/facts/2003/AllisonChin.shtml">Altitude of the lowest point on Mars</a></li> <li><a href="https://hypertextbook.com/facts/2001/KevinSookdeo.shtml">Altitude of the highest point on Mars</a></li> <li><a href="https://hypertextbook.com/facts/2005/KristinaArthurs.shtml">Altitude of the lowest parachute jump</a></li> <li><a href="https://hypertextbook.com/facts/2004/JerardKneifatiHayek.shtml">Altitude of the highest parachute jump</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/DanielCheng.shtml">Altitude of a commercial jet airplane</a></li> <li><a href="https://hypertextbook.com/facts/2004/MichaelCalamera.shtml">Altitude of a spy plane</a></li> <li><a href="https://hypertextbook.com/facts/2001/DanaWollman.shtml">Altitude of the highest airplane flight</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/JaneRubinshteyn.shtml">Altitude of the highest toy balloon flight</a></li> <li><a href="https://hypertextbook.com/facts/1997/CassandraEng.shtml">Altitude of the highest manned balloon flight</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/ValerieChang.shtml">Altitude of the highest unmanned balloon flight</a></li> <li><a href="https://hypertextbook.com/facts/1999/DmitryKhodorskiy.shtml">Altitude of the ozone layer</a></li> <li><a href="https://hypertextbook.com/facts/2000/AndresMok.shtml">Altitude of the space shuttle</a></li> <li><a href="https://hypertextbook.com/facts/2004/AlexandraKravtsova.shtml">Altitude of a geosynchronous or geostationary satellite</a></li> <li><a href="https://hypertextbook.com/facts/2006/centerofmass.shtml">Center of mass of a human</a></li> <li><a href="https://hypertextbook.com/facts/2006/AllenMa.shtml">Depth of the Grand Canyon</a></li> <li><a href="https://hypertextbook.com/facts/2004/MaxEisenstat.shtml">Depth of Valles Marineris</a></li> <li><a href="https://hypertextbook.com/facts/2003/YefimCavalier.shtml">Depth of the deepest mine</a></li> <li><a href="https://hypertextbook.com/facts/2003/AdamCassino.shtml">Depth of the deepest drilling</a></li> <li><a href="https://hypertextbook.com/facts/2009/RomanKlichinsky.shtml">Depth of the deepest dive without breathing apparatus</a></li> <li><a href="https://hypertextbook.com/facts/2005/MichaelCalamera.shtml">Depth of the deepest dive with breathing apparatus</a></li> <li>Depth of the deepest dive in a submarine</li> <li><a href="https://hypertextbook.com/facts/2003/KrystalBrewington.shtml">Depth of the deepest dive in a bathyscaphe</a></li> <li><a href="https://hypertextbook.com/facts/2006/HelenLi.shtml">Depth of the ocean</a></li> <li><a href="https://hypertextbook.com/facts/2004/CuiMiuChin.shtml">Depth of the deepest point in the ocean</a></li> <li><a href="https://hypertextbook.com/facts/2000/DannyDonohue.shtml">Diameter of an electron</a></li> <li><a href="https://hypertextbook.com/facts/1999/YelenaMeskina.shtml">Diameter of a proton</a></li> <li><a href="https://hypertextbook.com/facts/1996/MichaelPhillip.shtml">Diameter of an atom</a></li> <li><a href="https://hypertextbook.com/facts/1996/MichaelNicholas.shtml">Diameter of a virus</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/JoyceWong.shtml">Diameter of a bacterium</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/JennyNg.shtml">Diameter of a yeast</a></li> <li><a href="https://hypertextbook.com/facts/2001/GennadiyZemel.shtml">Diameter of a protozoan</a></li> <li><a href="https://hypertextbook.com/facts/1997/LaurenBoyd.shtml">Diameter of an optical fiber</a></li> <li><a href="https://hypertextbook.com/facts/1999/BrianLey.shtml">Diameter of a human hair</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/AniciaNdabahaliye1.shtml">Diameter of a human eye</a></li> <li><a href="https://hypertextbook.com/facts/1996/BrigidNaughton.shtml">Diameter of a snowflake</a></li> <li><a href="https://hypertextbook.com/facts/2001/IgorVolynets.shtml">Diameter of a raindrop</a>*</li> <li>Diameter of a hailstone</li> <li><a href="https://hypertextbook.com/facts/2003/MarinaBolotovsky.shtml">Diameter of a speck of dust</a></li> <li><a href="https://hypertextbook.com/facts/2000/IlanaPrice.shtml">Diameter of a grain of sand</a></li> <li>Diameter of a golf ball</li> <li>Diameter of a tennis ball</li> <li><a href="https://hypertextbook.com/facts/2009/RickyHe.shtml">Diameter of a baseball</a></li> <li>Diameter of a softball</li> <li><a href="https://hypertextbook.com/facts/2009/MarwaElfar.shtml">Diameter of a bowling ball</a></li> <li><a href="https://hypertextbook.com/facts/2009/TaisiaDubinina.shtml">Diameter of a football (soccer ball)</a></li> <li><a href="https://hypertextbook.com/facts/2009/TajallaDar.shtml">Diameter of a basketball</a></li> <li>Diameter of a cannonball</li> <li><a href="https://hypertextbook.com/facts/2007/SvetlanaSutskaya.shtml">Diameter of an igloo</a></li> <li><a href="https://hypertextbook.com/facts/1997/AnnaChernovetskaya.shtml">Diameter of Pluto</a></li> <li><a href="https://hypertextbook.com/facts/1999/RicardoMartinez.shtml">Diameter of earth</a></li> <li><a href="https://hypertextbook.com/facts/2004/CherisseBarnes.shtml">Diameter of the earth's orbit</a></li> <li><a href="https://hypertextbook.com/facts/2002/SamuelBernard1.shtml">Diameter of the moon</a></li> <li><a href="https://hypertextbook.com/facts/2005/CollinTam.shtml">Diameter of the moon's orbit</a></li> <li><a href="https://hypertextbook.com/facts/2004/AmyChan.shtml">Diameter of the sun</a></li> <li><a href="https://hypertextbook.com/facts/2004/StevenMai.shtml">Diameter of the solar system</a></li> <li><a href="https://hypertextbook.com/facts/1998/KarianFung.shtml">Diameter of the Milky Way</a></li> <li><a href="https://hypertextbook.com/facts/2002/CarmenBissessar.shtml">Diameter of the known universe</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/AliceWarrenGregory.shtml">Distance between carbon atoms</a></li> <li><a href="https://hypertextbook.com/facts/2007/MelissaTam.shtml">Distance of the longest putted golf ball</a></li> <li><a href="https://hypertextbook.com/facts/2004/CrystalCuevas.shtml">Distance of the longest driven golf ball</a>*</li> <li><a href="https://hypertextbook.com/facts/2004/EricaRosenthal.shtml">Distance of the longest batted baseball</a></li> <li><a href="https://hypertextbook.com/facts/2000/IleneSchneider.shtml">Distance of the farthest animal migration</a></li> <li><a href="https://hypertextbook.com/facts/1996/KathrynTam.shtml">Distance to the nearest star</a></li> <li><a href="https://hypertextbook.com/facts/1999/SaraLi.shtml">Distance to the nearest galaxy</a>*</li> <li><a href="https://hypertextbook.com/facts/1998/JiYoungLee.shtml">Distance to the most distant observed object</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/JuliaKhutoretskaya.shtml">Focal length of a human eye</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/RomaKaur.shtml">Focal length of eyeglasses</a></li> <li><a href="https://hypertextbook.com/facts/2008/MonaZawam.shtml">Focal length of a magnifying glass</a></li> <li><a href="https://hypertextbook.com/facts/2002/MiriamJanove.shtml">Focal length of a camera lens</a></li> <li>Focal length of binoculars</li> <li><a href="https://hypertextbook.com/facts/2002/JenniferHu.shtml">Focal length of an astronomical telescope</a></li> <li><a href="https://hypertextbook.com/facts/2003/BronislavaBanar.shtml">Height of a newborn baby</a></li> <li><a href="https://hypertextbook.com/facts/2007/SimasCeckauskas.shtml">Height of an adult human</a></li> <li><a href="https://hypertextbook.com/facts/2001/OlgaVapnyar.shtml">Height of the tallest tree</a></li> <li><a href="https://hypertextbook.com/facts/2003/MichaelAvigliano.shtml">Height of a pop fly</a></li> <li><a href="https://hypertextbook.com/facts/2006/JamesKim.shtml">Height of a domed stadium</a></li> <li><a href="https://hypertextbook.com/facts/2003/PerkhaAhmed.shtml">Height of the Great Pyramid</a></li> <li><a href="https://hypertextbook.com/facts/2002/RubyChoi.shtml">Height of the tallest building</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/BeataUnke.shtml">Height of the tallest mountain on earth</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/MarinaTsukerman.shtml">Height of the tallest mountain on Mars</a></li> <li><a href="https://hypertextbook.com/facts/1998/StevenChen.shtml">Length of a human DNA molecule</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/JenniferTran.shtml">Length of a human esophagus</a></li> <li><a href="https://hypertextbook.com/facts/2001/AnneMarieThomasino.shtml">Length of a human intestine</a></li> <li><a href="https://hypertextbook.com/facts/2001/AnnaTaran.shtml">Length of the human alimentary canal</a></li> <li><a href="https://hypertextbook.com/facts/2009/WilsonChen.shtml">Length of a lacrosse stick</a></li> <li><a href="https://hypertextbook.com/facts/2009/SiluChen.shtml">Length of a baseball bat</a></li> <li>Length of a golf club</li> <li>Length of a hockey stick</li> <li>Length of a javelin</li> <li><a href="https://hypertextbook.com/facts/2009/MonicaBuklan.shtml">Length of a fishing rod</a></li> <li><a href="https://hypertextbook.com/facts/2001/SarahTang.shtml">Length of a bowling alley</a></li> <li><a href="https://hypertextbook.com/facts/2001/NinTam.shtml">Length of a football field (American)</a></li> <li><a href="https://hypertextbook.com/facts/2003/FarrahAbuzahria.shtml">Length of a football field (Canadian)</a></li> <li><a href="https://hypertextbook.com/facts/2002/JenniferYu.shtml">Length of a football field (soccer pitch)</a></li> <li><a href="https://hypertextbook.com/facts/2006/MatthewKent.shtml">Length of high voltage electric power transmission lines</a></li> <li>Length of submarine telecommunications cables</li> <li><a href="https://hypertextbook.com/facts/2003/DianaYang.shtml">Range of a shotgun pellet</a></li> <li><a href="https://hypertextbook.com/facts/2002/DomnaAntoniadis.shtml">Range of a handgun bullet</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/JessicaWorrell.shtml">Range of a rifle bullet</a></li> <li><a href="https://hypertextbook.com/facts/2002/NickishaBerlus.shtml">Range of an artillery shell</a></li> <li><a href="https://hypertextbook.com/facts/2003/YuenWong.shtml">Range of a Scud missile</a></li> <li><a href="https://hypertextbook.com/facts/2002/ShirleyCheung.shtml">Range of a cruise missile</a></li> <li><a href="https://hypertextbook.com/facts/2003/AliciaWhite.shtml">Range of a ballistic missile</a></li> <li><a href="https://hypertextbook.com/facts/2000/IlyaSherman.shtml">Resolution of an electron microscope</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/GeetikaKumar.shtml">Resolution of an optical microscope</a></li> <li><a href="https://hypertextbook.com/facts/2001/JeannelleLouis.shtml">Resolution of a spy satellite</a></li> <li><a href="https://hypertextbook.com/facts/2001/InnaSokolyanskaya2.shtml">Separation between tracks on a CD</a></li> <li><a href="https://hypertextbook.com/facts/2002/AmyWu.shtml">Separation between tracks on a DVD</a></li> <li><a href="https://hypertextbook.com/facts/2006/bodyproportions.shtml">Size of a human: Body proportions</a></li> <li><a href="https://hypertextbook.com/facts/2007/shoesize.shtml">Size of a shoe: More body proportions</a></li> <li><a href="https://hypertextbook.com/facts/2001/JenniferShloming.shtml">Thickness of a cell membrane</a></li> <li><a href="https://hypertextbook.com/facts/2003/AlonaVorobyov.shtml">Thickness of a cell wall</a></li> <li><a href="https://hypertextbook.com/facts/1999/JeniferVilfranc.shtml">Thickness of gold leaf</a></li> <li><a href="https://hypertextbook.com/facts/2001/JuliaSherlis.shtml">Thickness of a piece of paper</a></li> <li>Thickness of a leaf</li> <li><a href="https://hypertextbook.com/facts/1999/DeneneWilliams.shtml">Thickness of a dollar bill</a></li> <li><a href="https://hypertextbook.com/facts/2007/AngieYuan.shtml">Thickness of Arctic ice</a></li> <li><a href="https://hypertextbook.com/facts/2000/EmmanuelleStJean.shtml">Thickness of the Greenland ice cap</a></li> <li><a href="https://hypertextbook.com/facts/2000/MaySy.shtml">Thickness of the Antarctic ice cap</a></li> <li><a href="https://hypertextbook.com/facts/2000/ChoTan.shtml">Thickness of the ozone layer</a></li> <li><a href="https://hypertextbook.com/facts/1998/AndreaPark.shtml">Thickness of earth's atmosphere</a></li> <li><a href="https://hypertextbook.com/facts/1998/ZahidQureshi.shtml">Thickness of Saturn's rings</a></li> <li><a href="https://hypertextbook.com/facts/2001/ElenaWon.shtml">Wavelength of the shortest electromagnetic waves</a></li> <li><a href="https://hypertextbook.com/facts/2001/RachelShapiro.shtml">Wavelength of the longest electromagnetic waves</a></li> <li><a href="https://hypertextbook.com/facts/2002/TahirAhmed.shtml">Wavelength of the sun's peak radiation output</a></li> <li><a href="https://hypertextbook.com/facts/2007/SusanZhao.shtml">Wavelength of maximum human visual sensitivity</a></li> <li><a href="https://hypertextbook.com/facts/2002/PavelBorodulin.shtml">Wavelength range of visible light</a></li> </ol> </li> <li> <h2><a id="bfield"></a>Magnetic Field (Magnetic Flux Density, Magnetic Induction)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/1999/DanielleCaruso.shtml">Magnetic field on earth</a></li> <li><a href="https://hypertextbook.com/facts/1999/AleksandraCzajka.shtml">Magnetic field on Jupiter</a></li> <li><a href="https://hypertextbook.com/facts/2001/RebeccaRudberg.shtml">Magnetic field of the Milky Way</a></li> <li><a href="https://hypertextbook.com/facts/2001/MingLui.shtml">Magnetic field inside a typical US home</a></li> <li><a href="https://hypertextbook.com/facts/2005/metrocard.shtml">Magnetic field of a MetroCard</a></li> <li><a href="https://hypertextbook.com/facts/2003/VietTran.shtml">Magnetic field near a cellular telephone</a></li> <li><a href="https://hypertextbook.com/facts/2007/magnetic-field.shtml">Magnetic field of a soft iron magnet</a></li> <li>Magnetic field inside a TV picture tube</li> <li><a href="https://hypertextbook.com/facts/1999/KeithHermanstyne.shtml">Magnetic field of a lifting electromagnet</a></li> <li><a href="https://hypertextbook.com/facts/1997/AllaReyfman.shtml">Magnetic field inside an MRI</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/AnnaWoo.shtml">Magnetic field of the strongest magnet</a>*</li> </ol> </li> <li> <h2><a id="mass"></a>Mass<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/1998/KimFaiWong.shtml">Mass of the heaviest man-made element</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/JudyMoy.shtml">Mass of a snowflake</a></li> <li><a href="https://hypertextbook.com/facts/1999/MichaelKodransky.shtml">Mass of a raindrop</a></li> <li>Mass of a hailstone</li> <li><a href="https://hypertextbook.com/facts/1999/ImranArif.shtml">Mass of a golf ball</a></li> <li><a href="https://hypertextbook.com/facts/2001/SamuelLai.shtml">Mass of a handball</a></li> <li><a href="https://hypertextbook.com/facts/2000/ShefiuAzeez.shtml">Mass of a tennis ball</a></li> <li><a href="https://hypertextbook.com/facts/2004/OluwoleOwoseni.shtml">Mass of a billiard ball</a></li> <li><a href="https://hypertextbook.com/facts/1999/ChristinaLee.shtml">Mass of a baseball</a></li> <li><a href="https://hypertextbook.com/facts/2001/WilliamPoon.shtml">Mass of a softball</a></li> <li><a href="https://hypertextbook.com/facts/2006/dodgeball.shtml">Mass of a dodge ball</a></li> <li><a href="https://hypertextbook.com/facts/2000/KendelBell.shtml">Mass of a football (American)</a></li> <li><a href="https://hypertextbook.com/facts/2002/LouiseHuang.shtml">Mass of a football (soccer ball)</a></li> <li><a href="https://hypertextbook.com/facts/2002/ZacharyCampbell.shtml">Mass of a bowling ball</a></li> <li><a href="https://hypertextbook.com/facts/2003/MarinaTheodoris.shtml">Mass of a grain of sand</a></li> <li><a href="https://hypertextbook.com/facts/2000/ShantayArmstrong.shtml">Mass of a bullet</a></li> <li><a href="https://hypertextbook.com/facts/2009/JenniferChung.shtml">Mass of a cannonball</a></li> <li>Mass of a chemical bomb</li> <li>Mass of a nuclear bomb or warhead</li> <li><a href="https://hypertextbook.com/facts/2002/MillicentOkereke.shtml">Mass of a penny</a></li> <li><a href="https://hypertextbook.com/facts/2003/BettyTan.shtml">Mass of a physics textbook</a></li> <li><a href="https://hypertextbook.com/facts/2000/YanaZorina.shtml">Mass of a car</a></li> <li><a href="https://hypertextbook.com/facts/2000/RuiBingZheng.shtml">Mass of a train</a></li> <li>Mass of an airplane, general aviation</li> <li>Mass of an airplane, commercial aviation</li> <li>Mass of a space shuttle</li> <li><a href="https://hypertextbook.com/facts/2004/EricChen.shtml">Mass of the World Trade Center</a></li> <li>Mass of a virus</li> <li><a href="https://hypertextbook.com/facts/2003/LouisSiu.shtml">Mass of a bacterium</a></li> <li><a href="https://hypertextbook.com/facts/2002/JordanLevine2.shtml">Mass of a dog</a></li> <li><a href="https://hypertextbook.com/facts/2003/EugeneShnayder.shtml">Mass of an elephant</a></li> <li><a href="https://hypertextbook.com/facts/2003/MichaelShmukler.shtml">Mass of a whale</a></li> <li><a href="https://hypertextbook.com/facts/2006/DmitriyGekhman.shtml">Mass of a human head</a></li> <li><a href="https://hypertextbook.com/facts/2003/RachelScottRosenbluth.shtml">Mass of a human brain</a></li> <li><a href="https://hypertextbook.com/facts/2006/StephanieGambino.shtml">Mass of a human heart</a></li> <li><a href="https://hypertextbook.com/facts/2004/MaryPennisi.shtml">Mass of a human liver</a></li> <li><a href="https://hypertextbook.com/facts/2002/LeahOppenheim1.shtml">Mass of a newborn baby</a></li> <li><a href="https://hypertextbook.com/facts/2003/AlexSchlessingerman.shtml">Mass of an adult</a></li> <li><a href="https://hypertextbook.com/facts/2006/DanielTouger.shtml">Mass of all the people on earth</a></li> <li><a href="https://hypertextbook.com/facts/2000/EdwardYee.shtml">Mass of US rice production</a></li> <li><a href="https://hypertextbook.com/facts/2001/YanaNisanov2.shtml">Mass of US corn production</a></li> <li><a href="https://hypertextbook.com/facts/2000/JenniferWang.shtml">Mass of US wheat production</a></li> <li><a href="https://hypertextbook.com/facts/2000/AshleyFleischer.shtml">Mass of US potato production</a></li> <li><a href="https://hypertextbook.com/facts/2001/DanielleNguyen.shtml">Mass of US heroin consumption</a></li> <li><a href="https://hypertextbook.com/facts/2003/JoshSchaikowitz.shtml">Mass of US cocaine consumption</a></li> <li><a href="https://hypertextbook.com/facts/2008/ShirlyTam.shtml">Mass of US marijuana production</a></li> <li><a href="https://hypertextbook.com/facts/2005/JerardKneifatiHayek.shtml">Mass of US marijuana consumption</a></li> <li><a href="https://hypertextbook.com/facts/2006/LauraFalci.shtml">Mass of US breakfast cereal consumption</a></li> <li>Mass of US salsa consumption<!-- 2003/BrittanyBerger.shtml removed on 11 June 2005 --></li> <li>Mass of US ketchup consumption<!-- 2003/AllaBerkolayko.shtml removed on 11 June 2005 --></li> <li><a href="https://hypertextbook.com/facts/2006/JennaConversano.shtml">Mass of US beef production</a></li> <li><a href="https://hypertextbook.com/facts/2007/MarceloBernal.shtml">Mass of US beef consumption</a></li> <li><a href="https://hypertextbook.com/facts/2000/KennyChen.shtml">Mass of trash produced by New York City</a></li> <li><a href="https://hypertextbook.com/facts/1999/LouiseLiu.shtml">Mass of the atmosphere</a></li> <li><a href="https://hypertextbook.com/facts/2001/AmandaMeyer.shtml">Mass of the biosphere</a></li> <li><a href="https://hypertextbook.com/facts/1998/AvijeetDut.shtml">Mass of the oceans</a></li> <li><a href="https://hypertextbook.com/facts/2002/SamanthaDong2.shtml">Mass of the earth</a></li> <li><a href="https://hypertextbook.com/facts/2002/AdaLi.shtml">Mass of the moon</a></li> <li><a href="https://hypertextbook.com/facts/2002/DavidEngel.shtml">Mass of Jupiter</a></li> <li><a href="https://hypertextbook.com/facts/1999/AllisonMak.shtml">Mass of Pluto</a></li> <li><a href="https://hypertextbook.com/facts/2001/KellyMaurelus.shtml">Mass needed to create a star</a></li> <li><a href="https://hypertextbook.com/facts/2000/LeonVaysburd.shtml">Mass of the sun</a></li> <li><a href="https://hypertextbook.com/facts/1997/DannyGoldner.shtml">Mass needed to create a neutron star</a>*</li> <li><a href="https://hypertextbook.com/facts/1998/JaredJagdeo.shtml">Mass needed to create a black hole</a></li> <li><a href="https://hypertextbook.com/facts/2000/AlinaVayntrub.shtml">Mass of the Milky Way</a></li> <li><a href="https://hypertextbook.com/facts/2006/KristineMcPherson.shtml">Mass of the universe</a></li> </ol> </li> <li> <h2><a id="money"></a>Money (Cost, Earnings, Income, Price, Salary, Worth)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2005/GeetaMalieckal.shtml">Cost of living in New York City</a></li> <li>Cost of living in the US</li> <li>Cost of living for the average person on earth</li> <li>Income of the average New Yorker</li> <li>Income of the average American</li> <li><a href="https://hypertextbook.com/facts/2006/MateNagy.shtml">Income of the average person on earth</a></li> <li><a href="https://hypertextbook.com/facts/2007/NadyaDillon.shtml">Price of liquid helium</a></li> <li><a href="https://hypertextbook.com/facts/2007/KarenFan.shtml">Price of liquid nitrogen</a></li> <li><a href="https://hypertextbook.com/facts/2004/JosephSabatelle.shtml">Price of water</a></li> <li><a href="https://hypertextbook.com/facts/2005/OlgaStachna.shtml">Price of petroleum (crude oil)</a></li> <li>Price of diesel fuel</li> <li><a href="https://hypertextbook.com/facts/2006/ScottSchechter.shtml">Price of gasoline</a></li> <li><a href="https://hypertextbook.com/facts/2008/AdaLau.shtml">Price of kerosene</a></li> <li>Price of propane</li> <li><a href="https://hypertextbook.com/facts/2006/MichelleSze.shtml">Price of natural gas</a></li> <li><a href="https://hypertextbook.com/facts/2005/CarolineGeorges.shtml">Price of coal</a></li> <li><a href="https://hypertextbook.com/facts/2005/NatalieGertsik.shtml">Price of ethanol (grain alcohol)</a></li> <li><a href="https://hypertextbook.com/facts/2006/CollinTam.shtml">Price of electric energy</a></li> <li>Price of concrete</li> <li><a href="https://hypertextbook.com/facts/2005/AlexGizersky.shtml">Price of steel</a></li> <li><a href="https://hypertextbook.com/facts/2004/LeoTam.shtml">Price of diamond</a></li> <li><a href="https://hypertextbook.com/facts/2006/JulieTan.shtml">Price of copper</a></li> <li><a href="https://hypertextbook.com/facts/2004/AbigailTang.shtml">Price of silver</a></li> <li><a href="https://hypertextbook.com/facts/2005/EugeneKondratov.shtml">Price of gold</a></li> <li><a href="https://hypertextbook.com/facts/2009/LinaNguyen.shtml">Price of platinum</a></li> <li><a href="https://hypertextbook.com/facts/2008/AndrewMorel.shtml">Price of plutonium</a></li> <li>Price of uranium</li> <li><a href="https://hypertextbook.com/facts/2009/IlyaReznikov.shtml">Price of a high school education</a></li> <li><a href="https://hypertextbook.com/facts/2004/ChrisanaWhite.shtml">Price of a college education</a></li> <li><a href="https://hypertextbook.com/facts/2006/MiaoLingWu.shtml">Salary of a professor</a></li> <li><a href="https://hypertextbook.com/facts/2006/EricaYauri.shtml">Salary of a teacher</a></li> <li><a href="https://hypertextbook.com/facts/2004/TiffanyYam.shtml">Salary of a doctor</a></li> <li><a href="https://hypertextbook.com/facts/2007/ArifHussain.shtml">Salary of an engineer</a></li> <li><a href="https://hypertextbook.com/facts/2005/DanielNopachinda.shtml">Salary of a biologist</a></li> <li><a href="https://hypertextbook.com/facts/2005/VictoriaPisarevskaya.shtml">Salary of a chemist</a></li> <li><a href="https://hypertextbook.com/facts/2005/VitaRymaruk.shtml">Salary of a geologist</a></li> <li><a href="https://hypertextbook.com/facts/2004/AneeAsma.shtml">Salary of a meteorologist</a></li> <li><a href="https://hypertextbook.com/facts/2006/JaminBennett.shtml">Salary of a physicist</a></li> <li><a href="https://hypertextbook.com/facts/2002/JonathanHamill2.shtml">Salary of a baseball player</a></li> <li><a href="https://hypertextbook.com/facts/2007/OluwemimoOladapo.shtml">Salary of a basketball player</a></li> <li><a href="https://hypertextbook.com/facts/2006/ChrisCha.shtml">Salary of a football player (American)</a></li> <li>Salary of a football player (Canadian)</li> <li><a href="https://hypertextbook.com/facts/2007/ImranAkhtar.shtml">Salary of a football player (soccer)</a></li> <li><a href="https://hypertextbook.com/facts/2005/KevinYam.shtml">Salary of a hockey player</a></li> <li>Worth of the average person in New York City</li> <li><a href="https://hypertextbook.com/facts/2008/MathieuEugene.shtml">Worth of the average person in the US</a></li> <li>Worth of the average person on earth</li> <li>Worth of the wealthiest person in New York City</li> <li><a href="https://hypertextbook.com/facts/2007/EugeneKolomiyets.shtml">Worth of the wealthiest person in the US</a></li> <li>Worth of the wealthiest person on earth</li> </ol> </li> <li> <h2><a id="number"></a>Number (Population)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2006/JenniferLeong.shtml">Number of colors distinguishable by the human eye</a></li> <li><a href="https://hypertextbook.com/facts/2005/AgathaCwalina.shtml">Number of frequencies distinguishable by the human ear</a></li> <li><a href="https://hypertextbook.com/facts/2002/AniciaNdabahaliye2.shtml">Number of neurons in a human brain</a></li> <li>Number of hairs on a human head</li> <li><a href="https://hypertextbook.com/facts/2001/SerafinaShishkova.shtml">Number of transistors on an integrated circuit</a></li> <li><a href="https://hypertextbook.com/facts/2002/SamanthaDong3.shtml">Number of pages in a science review book</a></li> <li>Number of pages in a physics textbook</li> <li><a href="https://hypertextbook.com/facts/2009/JianXunZheng.shtml">Number of books published</a></li> <li><a href="https://hypertextbook.com/facts/2007/LorantLee.shtml">Number of web pages</a></li> <li><a href="https://hypertextbook.com/facts/2005/YuenHFong.shtml">Number of nuclear weapons capable nations</a></li> <li><a href="https://hypertextbook.com/facts/2000/FannyTsui.shtml">Number of nuclear warheads</a>*</li> <li><a href="https://hypertextbook.com/facts/2004/VadimBlikshteyn.shtml">Number of artificial satellites</a></li> <li><a href="https://hypertextbook.com/facts/2001/MarinaStasenko.shtml">Number of cars</a>*</li> <li><a href="https://hypertextbook.com/facts/2004/DianeEnnefils.shtml">Number of personal computers in the US</a></li> <li><a href="https://hypertextbook.com/facts/2007/TamaraTamazashvili.shtml">Number of televisions in the US</a></li> <li>Number of telephones<span class="tight"> [US, other country or region, or world]</span></li> <li><a href="https://hypertextbook.com/facts/2002/BogusiaGrzywac.shtml">Number of cellular phones in the US</a></li> <li><a href="https://hypertextbook.com/facts/2007/ZhaoLiang.shtml">Number of crimes in New York City</a></li> <li><a href="https://hypertextbook.com/facts/2002/VitaliyShchupak2.shtml">Number of crimes in New York State</a></li> <li><a href="https://hypertextbook.com/facts/2003/MaryPennisi.shtml">Number of crimes in the US</a></li> <li><a href="https://hypertextbook.com/facts/2006/StaceyJohnson.shtml">Number of people in a family</a></li> <li><a href="https://hypertextbook.com/facts/2005/MichelleLee.shtml">Number of billionaires</a></li> <li><a href="https://hypertextbook.com/facts/2005/JenniferLeong.shtml">Number of people living in poverty</a></li> <li><a href="https://hypertextbook.com/facts/2002/BijuMathew.shtml">Number of people in New York City</a></li> <li><a href="https://hypertextbook.com/facts/2002/JohnnyAlicea3.shtml">Number of people in the US</a></li> <li><a href="https://hypertextbook.com/facts/2001/AnandMaharaj.shtml">Number of people on earth</a></li> <li><a href="https://hypertextbook.com/facts/2004/ChivonneHenriques.shtml">Number of births in New York City</a></li> <li><a href="https://hypertextbook.com/facts/2002/SamuelBernard2.shtml">Number of births in the US</a></li> <li><a href="https://hypertextbook.com/facts/2004/VanessaChambers.shtml">Number of births on earth</a></li> <li><a href="https://hypertextbook.com/facts/2005/TriciaMui.shtml">Number of deaths in New York City</a></li> <li><a href="https://hypertextbook.com/facts/2006/SahrishJaved.shtml">Number of deaths in the US</a></li> <li>Number of deaths on earth</li> <li><a href="https://hypertextbook.com/facts/2006/YulianaLeon.shtml">Number of obese people in the US</a></li> <li><a href="https://hypertextbook.com/facts/2002/JaneMin.shtml">Number of rats in New York City</a>*</li> <li>Number of pigeons in New York City</li> <li><a href="https://hypertextbook.com/facts/2003/AlisonOngvorapong.shtml">Number of ants in the world</a></li> <li><a href="https://hypertextbook.com/facts/2009/LarryYundelson.shtml">Number of cockroaches</a><!-- 2003/JonathanOng.shtml removed on 11 June 2005 --></li> <li><a href="https://hypertextbook.com/facts/2001/KeithSingh.shtml">Number of beetles</a></li> <li><a href="https://hypertextbook.com/facts/2003/BiancaNicoletti.shtml">Number of orchids</a></li> <li><a href="https://hypertextbook.com/facts/2003/FelixNisimov.shtml">Number of species</a></li> <li><a href="https://hypertextbook.com/facts/2007/DavidLouisia.shtml">Number of planets</a></li> <li><a href="https://hypertextbook.com/facts/2007/JasonLu.shtml">Number of asteroids</a></li> <li><a href="https://hypertextbook.com/facts/2009/JeffreyYep.shtml">Number of comets</a></li> <li>Number of extrasolar planets</li> <li><a href="https://hypertextbook.com/facts/2000/MarissaWager.shtml">Number of stars in the Milky Way</a></li> <li><a href="https://hypertextbook.com/facts/1999/TopazMurray.shtml">Number of galaxies in the universe</a></li> <li><a href="https://hypertextbook.com/facts/2001/JohnnyLing.shtml">Number of words in the English language</a></li> <li>Number of languages on earth</li> </ol> </li> <li> <h2><a id="power"></a>Power (Power Density)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2001/JacquelineLing.shtml">Power of a human brain</a></li> <li><a href="https://hypertextbook.com/facts/2003/IradaMuslumova.shtml">Power of a human heart</a></li> <li>Power of human lungs</li> <li><a href="https://hypertextbook.com/facts/2003/WeiLiangMok.shtml">Power of a human</a></li> <li><a href="https://hypertextbook.com/facts/2006/storm.shtml">Power of a mutant: Storm from X-Men</a></li> <li>Power of a horse<span class="tight"> [but, not just the definition of the unit horsepower]</span></li> <li><a href="https://hypertextbook.com/facts/2001/EtanMarciano.shtml">Power of a 1.5 V battery</a></li> <li>Power of a personal stereo</li> <li><a href="https://hypertextbook.com/facts/2003/ZhannaMikhaylova.shtml">Power of a car stereo</a></li> <li><a href="https://hypertextbook.com/facts/2001/AlexandraKougentakis.shtml">Power of a home stereo</a></li> <li><a href="https://hypertextbook.com/facts/2004/MeaghanFondiller.shtml">Power of a toaster</a></li> <li><a href="https://hypertextbook.com/facts/2007/TatyanaNektalova.shtml">Power of a microwave oven</a></li> <li>Power of an electric oven</li> <li><a href="https://hypertextbook.com/facts/2001/SambitMishra.shtml">Power of a refrigerator</a></li> <li><a href="https://hypertextbook.com/facts/2001/KaFungKan.shtml">Power of an air conditioner</a></li> <li><a href="https://hypertextbook.com/facts/2001/MelissaNg.shtml">Power of a car battery</a></li> <li><a href="https://hypertextbook.com/facts/2001/JaeheeJoh.shtml">Power of a car</a></li> <li><a href="https://hypertextbook.com/facts/2000/AlfredoVitale.shtml">Power of a truck</a></li> <li><a href="https://hypertextbook.com/facts/2001/RadmilaIlyayeva.shtml">Power of a train</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/HelenRoslyakova.shtml">Power of a cruise ship</a></li> <li><a href="https://hypertextbook.com/facts/2000/JosephReilly.shtml">Power of an aircraft carrier</a></li> <li><a href="https://hypertextbook.com/facts/2005/SaharTakkouche.shtml">Power of a fighter plane</a></li> <li><a href="https://hypertextbook.com/facts/2001/StaverieBoundouris.shtml">Power of a space shuttle</a></li> <li>Power of the first laser</li> <li>Power of a barcode reader laser</li> <li><a href="https://hypertextbook.com/facts/2003/AmyLy.shtml">Power of a laser pointer</a></li> <li><a href="https://hypertextbook.com/facts/1999/LizaLi.shtml">Power of the strongest laser</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/YatManTsui.shtml">Power of car headlights</a></li> <li><a href="https://hypertextbook.com/facts/2004/MarinaAvetisyan.shtml">Power of a streetlight</a></li> <li><a href="https://hypertextbook.com/facts/2009/TonieMcKenzie.shtml">Power of a searchlight</a></li> <li><a href="https://hypertextbook.com/facts/2005/DariaZainullina.shtml">Power of a lighthouse</a></li> <li><a href="https://hypertextbook.com/facts/2006/EbruBek.shtml">Power of a cell phone transmitter</a></li> <li>Power of a cell site transmitter</li> <li>Power of a radio/television broadcast transmitter</li> <li><a href="https://hypertextbook.com/facts/2000/HansOrejuela.shtml">Power of a commercial power plant</a></li> <li><a href="https://hypertextbook.com/facts/1997/JasminMarin.shtml">Power of a nuclear reactor</a></li> <li><a href="https://hypertextbook.com/facts/2003/BoiLu.shtml">Power consumption of a home</a></li> <li>Power consumption of New York City</li> <li><a href="https://hypertextbook.com/facts/2001/PollyHo.shtml">Power consumption of New York State</a></li> <li><a href="https://hypertextbook.com/facts/2001/KatyHo.shtml">Power consumption of the United States</a></li> <li><a href="https://hypertextbook.com/facts/2004/MariyaGolub.shtml">Power consumption of China</a></li> <li>Power consumption of Africa</li> <li>Power consumption of Asia</li> <li>Power consumption of Australia</li> <li>Power consumption of Europe</li> <li>Power consumption of North America</li> <li>Power consumption of South America</li> <li><a href="https://hypertextbook.com/facts/2001/JenniferGreen.shtml">Power consumption of the earth</a></li> <li><a href="https://hypertextbook.com/facts/1999/MatthewTsang.shtml">Power of the sun</a>*</li> <li><a href="https://hypertextbook.com/facts/2007/DanielTouger.shtml">Power of a quasar</a></li> <li><a href="https://hypertextbook.com/facts/1998/ManicaPiputbundit.shtml">Power density of solar radiation</a></li> </ol> </li> <li> <h2><a id="pressure"></a>Pressure (Compression Strength)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2007/sincity.shtml">Compression strength of bone and brick: Sin City</a></li> <li>Compression strength of bone</li> <li>Compression strength of brick</li> <li>Compression strength of concrete</li> <li>Compression strength of granite</li> <li>Compression strength of marble</li> <li>Compression strength of plaster (blue board, drywall, gypsum board, etc.)</li> <li>Compression strength of porcelain</li> <li>Compression strength of steel</li> <li>Compression strength of wood</li> <li><a href="https://hypertextbook.com/facts/2002/MimiZheng.shtml">Pressure in outer space</a>*</li> <li><a href="https://hypertextbook.com/facts/1998/RobertSaronson.shtml">Pressure of the best laboratory vacuum</a></li> <li>Pressure of the threshold of human hearing</li> <li><a href="https://hypertextbook.com/facts/2007/ShemikaWhite.shtml">Pressure to rupture an eardrum</a></li> <li><a href="https://hypertextbook.com/facts/2001/ZlataGolubitskaya.shtml">Pressure in a human eye</a></li> <li><a href="https://hypertextbook.com/facts/1999/IrinaVinar.shtml">Pressure in the human circulatory system (blood pressure)</a>*</li> <li><a href="https://hypertextbook.com/facts/2007/bloodpressure.shtml">Pressure in the human circulatory system: Is gender a factor</a>?</li> <li>Pressure in human lungs</li> <li><a href="https://hypertextbook.com/facts/2005/FlorenceHang.shtml">Pressure on earth, highest</a></li> <li><a href="https://hypertextbook.com/facts/2001/JaredGoldberger.shtml">Pressure on earth, lowest</a></li> <li><a href="https://hypertextbook.com/facts/2000/NangMiu.shtml">Pressure on the surface of Venus</a></li> <li><a href="https://hypertextbook.com/facts/2000/LaurenMikulski.shtml">Pressure on the surface of Mars</a></li> <li><a href="https://hypertextbook.com/facts/2006/MelanieNg.shtml">Pressure on the surface of Titan</a></li> <li>Pressure in a basketball</li> <li><a href="https://hypertextbook.com/facts/2003/SharaKhan.shtml">Pressure in a bicycle tire</a></li> <li><a href="https://hypertextbook.com/facts/2007/BrianMarino.shtml">Pressure in a car tire</a></li> <li><a href="https://hypertextbook.com/facts/2003/AlexandraKanonik.shtml">Pressure in a truck tire</a></li> <li><a href="https://hypertextbook.com/facts/2007/SuzannaZhou.shtml">Pressure in a tractor tire</a></li> <li><a href="https://hypertextbook.com/facts/2000/SeemaMeraj.shtml">Pressure in a can of soda</a></li> <li><a href="https://hypertextbook.com/facts/2003/PeterHui.shtml">Pressure in a champagne bottle</a></li> <li><a href="https://hypertextbook.com/facts/2008/IslamSoliman.shtml">Pressure in a pressure cooker</a></li> <li><a href="https://hypertextbook.com/facts/2005/KennyNgo.shtml">Pressure in an espresso machine</a></li> <li><a href="https://hypertextbook.com/facts/2005/GeorgePayyapilli.shtml">Pressure used to manufacture puffed cereal</a></li> <li><a href="https://hypertextbook.com/facts/2005/VictoriaPoon.shtml">Pressure in a fire extinguisher</a></li> <li><a href="https://hypertextbook.com/facts/2003/JackGreen.shtml">Pressure under high heels</a></li> <li><a href="https://hypertextbook.com/facts/2003/SheenaGrant.shtml">Pressure at the deepest point in the Great Lakes</a></li> <li><a href="https://hypertextbook.com/facts/1998/SusannaTran.shtml">Pressure at the deepest point in the oceans</a></li> <li>Pressure under the Antarctic ice cap</li> <li><a href="https://hypertextbook.com/facts/1998/IleneWeintraub.shtml">Pressure used to create artificial diamonds</a></li> <li>Pressure of the most extreme laboratory experiment</li> <li><a href="https://hypertextbook.com/facts/1999/PavelKhazron.shtml">Pressure at the center of the earth</a>*</li> <li>Pressure at the center of Jupiter</li> <li><a href="https://hypertextbook.com/facts/1997/MarinaTreybick.shtml">Pressure at the center of the sun</a></li> </ol> </li> <li> <h2><a id="index"></a>Refraction (Index of Refraction, Refractive Index)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2005/MayaBarsky.shtml">Index of refraction of air</a></li> <li><a href="https://hypertextbook.com/facts/2005/JaminBennett.shtml">Index of refraction of diamond</a></li> <li>Index of refraction of ethanol<span class="tight"> [ethyl alcohol]</span></li> <li><a href="https://hypertextbook.com/facts/2005/JustinChe.shtml">Index of refraction of glass, crown</a></li> <li><a href="https://hypertextbook.com/facts/2008/SydneyWarshaw.shtml">Index of refraction of glass, flint</a></li> <li><a href="https://hypertextbook.com/facts/2005/ShirleyDeng.shtml">Index of refraction of glycerol</a></li> <li><a href="https://hypertextbook.com/facts/2005/EmreErdal.shtml">Index of refraction of Lucite</a></li> <li><a href="https://hypertextbook.com/facts/2005/GilFishman.shtml">Index of refraction of quartz</a></li> <li>Index of refraction of ruby and sapphire</li> <li><a href="https://hypertextbook.com/facts/2005/AlinaGenis.shtml">Index of refraction of sodium chloride (table salt)</a></li> <li><a href="https://hypertextbook.com/facts/2006/TingTingLuo.shtml">Index of refraction of vegetable oil</a></li> <li><a href="https://hypertextbook.com/facts/2005/AmyHo.shtml">Index of refraction of water</a></li> <li><a href="https://hypertextbook.com/facts/2005/MunifHussain.shtml">Index of refraction of ice</a></li> <li><a href="https://hypertextbook.com/facts/2007/JeanneChau.shtml">Index of refraction of cubic zirconia</a></li> <li>Index of refraction of<span class="tight"> various household liquids:</span> <a href="2005/index.shtml">glycerin, floor cleaner, degreaser, shower gel, baby wash</a></li> <li>Index of refraction of<span class="tight"> various household liquids:</span> <a href="2005/refraction.shtml">vinegar, honey, floor cleaner, throat medicine, foot wash</a></li> </ol> </li> <li> <h2><a id="cor"></a>Restitution (Coefficient of Restitution)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2006/restitution.shtml">Coefficients of restitution</a></li> </ol> </li> <li> <h2><a id="temperature"></a>Temperature<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2001/NehemieCange.shtml">Temperature of the coldest laboratory experiment</a></li> <li><a href="https://hypertextbook.com/facts/2003/TiffanyGillyard.shtml">Temperature of the hottest laboratory experiment</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/JudyTang.shtml">Temperature on earth</a></li> <li><a href="https://hypertextbook.com/facts/2000/YongLiLiang.shtml">Temperature on earth, coldest</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/MichaelLevin.shtml">Temperature on earth, hottest</a>*</li> <li><a href="https://hypertextbook.com/facts/2007/LilyLi.shtml">Temperature of the ocean</a></li> <li><a href="https://hypertextbook.com/facts/1997/LenaWong.shtml">Temperature of a healthy human (body temperature)</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/AbantyFarzana.shtml">Temperature of a healthy human (skin temperature)</a></li> <li><a href="https://hypertextbook.com/facts/1998/PeiJunChen.shtml">Temperature of a healthy cow</a></li> <li><a href="https://hypertextbook.com/facts/1999/JieYaoHuang.shtml">Temperature of a healthy dog</a></li> <li>Temperature of an American bath</li> <li><a href="https://hypertextbook.com/facts/2005/LouisWilliamTullo.shtml">Temperature of a Japanese bath <span style="white-space:nowrap;">(お風呂)</span></a></li> <li><a href="https://hypertextbook.com/facts/2005/HimtangWong.shtml">Temperature of a sauna</a></li> <li><a href="https://hypertextbook.com/facts/2003/DianaGendler.shtml">Temperature at which coffee is brewed</a></li> <li><a href="https://hypertextbook.com/facts/2005/KarenYee1.shtml">Temperature at which tea is brewed</a>, <a href="2005/KarenYee2.shtml" style="white-space:nowrap;">茶酿造的温度</a></li> <li><a href="https://hypertextbook.com/facts/2005/OrinZahra.shtml">Temperature at which beer is brewed</a></li> <li><a href="https://hypertextbook.com/facts/2004/GinaJohn.shtml">Temperature at which beer is fermented</a></li> <li><a href="https://hypertextbook.com/facts/2004/StaceyJohnson.shtml">Temperature of steam in an espresso machine</a></li> <li>Temperature at which beef is cooked</li> <li><a href="https://hypertextbook.com/facts/2007/OlubunmiFashusi.shtml">Temperature at which chicken is cooked</a></li> <li><a href="https://hypertextbook.com/facts/2006/LorantLee.shtml">Temperature at which fish is cooked</a></li> <li><a href="https://hypertextbook.com/facts/2007/JannatulFerdaus.shtml">Temperature at which lamb is cooked</a></li> <li><a href="https://hypertextbook.com/facts/2007/KarenFreire.shtml">Temperature at which pork is cooked</a></li> <li>Temperature of steam used for heating</li> <li><a href="https://hypertextbook.com/facts/2003/AlanFurmanov.shtml">Temperature of steam in a turbine</a></li> <li><a href="https://hypertextbook.com/facts/2005/JenniferZhong.shtml">Temperature of a home oven</a></li> <li><a href="https://hypertextbook.com/facts/2003/SaraElzeftawy.shtml">Temperature of a pizza oven</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/LillianDvirts.shtml">Temperature of a soldering iron</a>*</li> <li>Temperature of an arc welder<span class="tight"> [not a MIG or TIG]</span></li> <li><a href="https://hypertextbook.com/facts/2003/EstherDorzin.shtml">Temperature of a MIG welder</a></li> <li><a href="https://hypertextbook.com/facts/2007/AnthonyHo.shtml">Temperature of a TIG welder</a></li> <li><a href="https://hypertextbook.com/facts/2002/AnthonyCheedie.shtml">Temperature of an oxyacetylene torch</a></li> <li><a href="https://hypertextbook.com/facts/2002/JohnChu.shtml">Temperature of a blast furnace</a></li> <li><a href="https://hypertextbook.com/facts/2006/ArifHussain.shtml">Temperature of an arc furnace</a></li> <li><a href="https://hypertextbook.com/facts/2000/StephanieLum.shtml">Temperature of a "red hot" object</a></li> <li><a href="https://hypertextbook.com/facts/2001/CarineFang.shtml">Temperature of a "white hot" object</a></li> <li><a href="https://hypertextbook.com/facts/1999/PhillipChan.shtml">Temperature at the center of the earth</a></li> <li><a href="https://hypertextbook.com/facts/1999/JaneFishler.shtml">Temperature of a candle flame</a></li> <li><a href="https://hypertextbook.com/facts/1998/JamesDanyluk.shtml">Temperature of a blue flame</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/AlexanderEng.shtml">Temperature of an incandescent light bulb</a>*</li> <li><a href="https://hypertextbook.com/facts/2003/ElaineDevora.shtml">Temperature of a halogen light bulb</a></li> <li><a href="https://hypertextbook.com/facts/1999/DavidFriedman.shtml">Temperature of a lightning bolt</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/SimonFung.shtml">Temperature of a nuclear explosion</a>*</li> <li><a href="https://hypertextbook.com/facts/1997/SilinYang.shtml">Temperature of the cosmic microwave background radiation</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/OlesyaNisanov.shtml">Temperature on the surface of Mercury</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/GeorgeRyabov.shtml">Temperature on the surface of Venus</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/AlbertEydelman.shtml">Temperature on the surface of Mars</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/PaulStengel.shtml">Temperature on the surface of Pluto</a></li> <li><a href="https://hypertextbook.com/facts/1997/GlyniseFinney.shtml">Temperature on the surface of the sun</a></li> <li><a href="https://hypertextbook.com/facts/1997/DedraForbes.shtml">Temperature at the center of the sun</a></li> <li><a href="https://hypertextbook.com/facts/2001/AsserEstriplet.shtml">Temperature of the hottest star</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/CCoraThomas.shtml">Temperature of the sun's corona</a></li> <li><a href="https://hypertextbook.com/facts/2002/FeliciaLau.shtml">Curie temperature of iron</a></li> <li><a href="https://hypertextbook.com/facts/2005/YasminSinclair.shtml">Curie temperature of cobalt</a></li> <li><a href="https://hypertextbook.com/facts/2005/StephanieMa.shtml">Curie temperature of nickel</a></li> <li><a href="https://hypertextbook.com/facts/2004/AndrewLee.shtml">Curie temperature of gadolinium</a></li> <li><a href="https://hypertextbook.com/facts/2002/MichaelNg.shtml">Highest critical temperature superconductor</a></li> <li><a href="https://hypertextbook.com/facts/2003/LewisChung.shtml">Ignition temperature of paper</a></li> <li><a href="https://hypertextbook.com/facts/2003/ShaniChristopher.shtml">Ignition temperature of gasoline</a></li> <li><a href="https://hypertextbook.com/facts/2005/EileenTang.shtml">Ignition temperature of diesel fuel</a></li> <li><a href="https://hypertextbook.com/facts/2003/JessicaCheung.shtml">Melting point of butter</a></li> <li><a href="https://hypertextbook.com/facts/2004/HarveyLei.shtml">Melting point of cocoa butter</a></li> <li><a href="https://hypertextbook.com/facts/2002/SaiLee.shtml">Melting point of glass</a></li> </ol> </li> <li> <h2><a id="time"></a>Time (Age, Duration, Half‑life, Period)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/1997/TroyHolder.shtml">Age of Homo sapiens</a></li> <li><a href="https://hypertextbook.com/facts/1997/RonHuggins.shtml">Age of life on earth</a></li> <li><a href="https://hypertextbook.com/facts/1997/MollyMoran.shtml">Age of the earth</a></li> <li><a href="https://hypertextbook.com/facts/1999/RachelHoover.shtml">Age of the universe</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/LarisaTuchinskaya.shtml">Duration of the shortest laser pulse</a></li> <li>Duration of a sound bite</li> <li><a href="https://hypertextbook.com/facts/2006/KieshaHarding.shtml">Duration of the longest space flight</a></li> <li><a href="https://hypertextbook.com/facts/2006/reactiontime.shtml">Fingertip reaction time</a></li> <li><a href="https://hypertextbook.com/facts/1997/MargaretKong.shtml">Half‑life of carbon‑14</a></li> <li><a href="https://hypertextbook.com/facts/1999/JaniceChing.shtml">Half‑life of plutonium‑239</a></li> <li><a href="https://hypertextbook.com/facts/2006/subwaydoors.shtml">How long do the subway doors stay open</a>?</li> <li><a href="https://hypertextbook.com/facts/1998/PavelMatskevich.shtml">Period between heartbeats</a></li> <li><a href="https://hypertextbook.com/facts/2001/TiffanyEng.shtml">Period of the human menstrual cycle</a></li> <li><a href="https://hypertextbook.com/facts/2007/CarolHsin.shtml">Period of a pulsar</a></li> <li><a href="https://hypertextbook.com/facts/1999/JennyChen.shtml">Period of rotation of the earth</a></li> <li><a href="https://hypertextbook.com/facts/2001/MarcEpstein.shtml">Period of the moon's orbit</a></li> <li><a href="https://hypertextbook.com/facts/1999/RadhikaKapoor.shtml">Period of rotation of the sun</a></li> <li><a href="https://hypertextbook.com/facts/1999/JessicaBrodkin.shtml">Period of rotation of Venus</a></li> <li><a href="https://hypertextbook.com/facts/1999/CrissyBilyk.shtml">Period of rotation of Pluto</a></li> <li><a href="https://hypertextbook.com/facts/1999/MitchellKrasnerman.shtml">Period of the earth's orbit</a></li> <li><a href="https://hypertextbook.com/facts/2002/StacyLeong.shtml">Period of the sun's orbit around the galaxy (cosmic year)</a></li> <li>Time spent driving to work</li> <li><a href="https://hypertextbook.com/facts/2005/RoryAbrams.shtml">Time spent at work</a></li> <li><a href="https://hypertextbook.com/facts/2002/PatrickLi.shtml">Time spent sleeping</a></li> </ol> </li> <li> <h2><a id="velocity"></a>Velocity (Speed)<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li><a href="https://hypertextbook.com/facts/2000/ElaineKung.shtml">Speed of a bacterium</a></li> <li><a href="https://hypertextbook.com/facts/2000/RossKrupnik.shtml">Speed of a protozoan</a></li> <li><a href="https://hypertextbook.com/facts/2000/EugeneKogan.shtml">Speed of a sperm cell</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/AngieYee.shtml">Speed of a snail</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/IvyWeinberg.shtml">Speed of a sloth</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/RachelShweky.shtml">Speed of a tortoise or turtle</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/RobertCohen.shtml">Speed of a rabbit or hare</a></li> <li><a href="https://hypertextbook.com/facts/2000/IsaacKlein.shtml">Speed of a tuna</a></li> <li><a href="https://hypertextbook.com/facts/1999/JenniferPuglia.shtml">Speed of a shark</a></li> <li><a href="https://hypertextbook.com/facts/2001/BarrymoreJoseph.shtml">Speed of a dolphin</a></li> <li><a href="https://hypertextbook.com/facts/2001/AnansaLatiff.shtml">Speed of a whale</a></li> <li><a href="https://hypertextbook.com/facts/1999/AlexSchuster.shtml">Speed of a cheetah</a>*</li> <li><a href="https://hypertextbook.com/facts/2004/GeetaMalieckal.shtml">Speed of the fastest dog</a></li> <li><a href="https://hypertextbook.com/facts/2000/AndrewSigal.shtml">Speed of the fastest horse</a></li> <li><a href="https://hypertextbook.com/facts/1999/ChrisSantoro.shtml">Speed of the fastest bird</a></li> <li><a href="https://hypertextbook.com/facts/2007/screamingmonkey.shtml">Speed of a Screaming Slingshot Monkey</a></li> <li><a href="https://hypertextbook.com/facts/2006/footwear.shtml">Speed of a human running: Is footwear a factor</a>?</li> <li><a href="https://hypertextbook.com/facts/2007/charlesbarkley.shtml">Speed of a Retired Basketball Player: Charles Barkley and Dick Bavetta</a></li> <li><a href="https://hypertextbook.com/facts/2007/madden.shtml">Speed of a football player: Madden NFL 2006</a></li> <li><a href="https://hypertextbook.com/facts/2007/smallville.shtml">Speed of superhero: Smallville</a></li> <li><a href="https://hypertextbook.com/facts/2000/NoahKalkstein.shtml">Speed of the fastest human, swimming</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/ConnieLau.shtml">Speed of the fastest human, walking</a></li> <li><a href="https://hypertextbook.com/facts/2000/KatarzynaJanuszkiewicz.shtml">Speed of the fastest human, running</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/SiddiquaMohammed.shtml">Speed of the fastest human, skating</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/AileenChou.shtml">Speed of the fastest human, cycling</a></li> <li><a href="https://hypertextbook.com/facts/2001/SharenChin.shtml">Speed of the fastest human, sledding</a></li> <li><a href="https://hypertextbook.com/facts/2000/IgorFridman.shtml">Speed of the fastest human, skiing</a></li> <li><a href="https://hypertextbook.com/facts/2000/LoriGrabel.shtml">Speed of the fastest pitched baseball</a>*</li> <li>Speed of the fastest pitched softball</li> <li><a href="https://hypertextbook.com/facts/2001/TinaCheung.shtml">Speed of the fastest served tennis ball</a></li> <li><a href="https://hypertextbook.com/facts/2002/JennyMai.shtml">Speed of the fastest jai alai ball</a></li> <li><a href="https://hypertextbook.com/facts/2006/dodgeball.shtml">Speed of a dodge ball</a></li> <li><a href="https://hypertextbook.com/facts/2006/BishoyEmmanuel.shtml">Speed of a golf ball</a></li> <li><a href="https://hypertextbook.com/facts/2006/bludger.shtml">Speed of a rogue bludger: Harry Potter</a></li> <li>Speed of a bowling ball</li> <li><a href="https://hypertextbook.com/facts/2006/ShuMeiDeng.shtml">Speed of the fastest badminton shuttlecock</a></li> <li><a href="https://hypertextbook.com/facts/2007/troy.shtml">Speed of a spear: Troy</a></li> <li><a href="https://hypertextbook.com/facts/1998/JianHuang.shtml">Speed of a skydiver (terminal velocity)</a>*</li> <li><a href="https://hypertextbook.com/facts/1997/ZhenHuang.shtml">Speed of the continental plates</a>*</li> <li>Speed of seismic waves</li> <li>Speed of a tsunami</li> <li><a href="https://hypertextbook.com/facts/2006/NervanaGaballa.shtml">Speed of a river</a></li> <li><a href="https://hypertextbook.com/facts/2002/EugeneStatnikov.shtml">Speed of ocean currents</a></li> <li>Speed of a falling snowflake</li> <li><a href="https://hypertextbook.com/facts/2007/EvanKaplan.shtml">Speed of a falling raindrop</a></li> <li><a href="https://hypertextbook.com/facts/2005/AliciaKosiba.shtml">Speed of a falling hailstone</a></li> <li><a href="https://hypertextbook.com/facts/2006/saruman.shtml">Speed of falling Saruman: Lord of the Rings</a></li> <li><a href="https://hypertextbook.com/facts/1999/StephanieStern.shtml">Speed of the winds in a hurricane</a></li> <li><a href="https://hypertextbook.com/facts/1999/ShamimRizvi.shtml">Speed of the winds in a tornado</a></li> <li><a href="https://hypertextbook.com/facts/2002/DavidParizh.shtml">Speed of nerve impulses</a></li> <li><a href="https://hypertextbook.com/facts/2000/CheukWong.shtml">Speed of sound in air</a></li> <li><a href="https://hypertextbook.com/facts/2000/NickyDu.shtml">Speed of sound in water</a></li> <li><a href="https://hypertextbook.com/facts/2001/PamelaSpiegel.shtml">Speed of sound through the earth</a></li> <li><a href="https://hypertextbook.com/facts/2005/NataliaMaldonado.shtml">Speed of video tape</a></li> <li><a href="https://hypertextbook.com/facts/2000/TienHueyHeh.shtml">Speed of audio tape</a></li> <li><a href="https://hypertextbook.com/facts/2001/AnnyPeng.shtml">Speed of a phonograph record</a></li> <li><a href="https://hypertextbook.com/facts/2000/LawrenceFung.shtml">Speed of a CD</a></li> <li><a href="https://hypertextbook.com/facts/2000/BellaFridman.shtml">Speed of a DVD</a></li> <li>Speed of a subway</li> <li><a href="https://hypertextbook.com/facts/2007/batman.shtml">Speed of a subway: Batman Begins</a></li> <li><a href="https://hypertextbook.com/facts/2002/JobyJosekutty.shtml">Speed of a commercial jet airplane</a></li> <li><a href="https://hypertextbook.com/facts/1999/WendyNg.shtml">Speed of a torpedo</a>*</li> <li>Speed of a BB</li> <li>Speed of a paintball</li> <li><a href="https://hypertextbook.com/facts/1999/MariaPereyra.shtml">Speed of a bullet</a></li> <li>Speed of a cannonball</li> <li><a href="https://hypertextbook.com/facts/2003/GabrielaBis.shtml">Speed of an artillery shell</a></li> <li><a href="https://hypertextbook.com/facts/1999/SeanManning.shtml">Speed of a missile</a></li> <li><a href="https://hypertextbook.com/facts/1999/JamesYu.shtml">Speed of the fastest ship</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/StefanSingh.shtml">Speed of the fastest train</a>*</li> <li><a href="https://hypertextbook.com/facts/2001/JerryChan.shtml">Speed of the fastest motorcycle</a></li> <li><a href="https://hypertextbook.com/facts/2000/MichaelFeldman.shtml">Speed of the fastest street legal car</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/MichaelMirochnik.shtml">Speed of a stock car</a></li> <li><a href="https://hypertextbook.com/facts/2004/RobertNapolitano.shtml">Speed of a formula one car</a></li> <li><a href="https://hypertextbook.com/facts/2006/DavisChen.shtml">Speed of a dragster or funny car</a></li> <li><a href="https://hypertextbook.com/facts/2001/JanetChan.shtml">Speed of the fastest experimental car</a></li> <li><a href="https://hypertextbook.com/facts/1998/AvivaLaurenti.shtml">Speed of the fastest airplane</a>*</li> <li><a href="https://hypertextbook.com/facts/2005/LeoTam.shtml">Speed needed to escape the earth (escape velocity)</a></li> <li><a href="https://hypertextbook.com/facts/2001/InnaSokolyanskaya1.shtml">Speed of a space shuttle</a></li> <li><a href="https://hypertextbook.com/facts/1997/PatricePean.shtml">Speed of the Voyager space probes</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/IlanaEpstein.shtml">Speed of the earth in orbit</a></li> <li><a href="https://hypertextbook.com/facts/2001/AngelaChan.shtml">Speed of the sun</a></li> <li><a href="https://hypertextbook.com/facts/2004/RomanOsatinski.shtml">Speed of the solar wind</a></li> <li><a href="https://hypertextbook.com/facts/1999/PatriciaKong.shtml">Speed of the Milky Way in space</a>*</li> <li><a href="https://hypertextbook.com/facts/2002/JohnnyAlicea2.shtml">Speed of light</a></li> <li><a href="https://hypertextbook.com/facts/2005/BadBoys2.shtml">Speed of a car: Bad Boys II</a></li> <li><a href="https://hypertextbook.com/facts/2005/BluesBrothers.shtml">Speed of a car: The Blues Brothers</a></li> <li><a href="https://hypertextbook.com/facts/2005/Rendezvous.shtml">Speed of a car: C'était un Rendezvous</a></li> <li><a href="https://hypertextbook.com/facts/2005/FrenchConnection.shtml">Speed of a car: The French Connection</a></li> <li><a href="https://hypertextbook.com/facts/2006/hondacivic.shtml">Speed of a car: Honda Civic Si commercial</a></li> <li><a href="https://hypertextbook.com/facts/2005/LeMans.shtml">Speed of a car: Le Mans (Steve McQueen, 1971)</a></li> <li><a href="https://hypertextbook.com/facts/2007/roadtrip.shtml">Speed of a car: Road Trip</a></li> <li><a href="https://hypertextbook.com/facts/2005/TheRun.shtml">Speed of a car: The Run</a></li> <li><a href="https://hypertextbook.com/facts/2005/BirdBaseball.shtml">Speed of a baseball: Bird Baseball</a></li> <li><a href="https://hypertextbook.com/facts/2007/cliffdive.shtml">Speed of a cliff diver: Huge Cliff Jump</a></li> <li><a href="https://hypertextbook.com/facts/2005/IraqiDiving.shtml">Speed of a cliff diver: Iraqi Olympic Diving</a></li> <li><a href="https://hypertextbook.com/facts/2007/jackass.shtml">Speed of a minibike: Jackass Number Two</a></li> <li><a href="https://hypertextbook.com/facts/2005/LoadingABike.shtml">Speed of a motorcycle: Loading a Bike</a></li> <li><a href="https://hypertextbook.com/facts/2005/SnowJump.shtml">Speed of a snowmobile: Snow Jump</a></li> </ol> </li> <li> <h2><a id="volume"></a>Volume<a href="#foreheadless" title="jump to the top" class="jumpup">☝</a></h2> <ol> <li>Volume of a drop of water</li> <li><a href="https://hypertextbook.com/facts/2001/VitaliyShchupak.shtml">Volume of a human heart</a></li> <li><a href="https://hypertextbook.com/facts/2001/ViktoriyaShchupak.shtml">Volume of a human brain</a></li> <li><a href="https://hypertextbook.com/facts/2001/DanielShaw.shtml">Volume of a human bladder</a></li> <li><a href="https://hypertextbook.com/facts/2000/JonathanCheng.shtml">Volume of a human stomach</a></li> <li><a href="https://hypertextbook.com/facts/2001/LaurenCalabrese.shtml">Volume of human lungs</a></li> <li><a href="https://hypertextbook.com/facts/1998/LanNaLee.shtml">Volume of blood in a human</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/JessicaHowellONeill.shtml">Volume of water consumed by New York City</a></li> <li><a href="https://hypertextbook.com/facts/2003/RossBernstein.shtml">Volume of water consumed by the US</a></li> <li><a href="https://hypertextbook.com/facts/2001/NaomiSaintJean.shtml">Volume of bottled water consumption</a></li> <li><a href="https://hypertextbook.com/facts/2001/ChristiaanRule.shtml">Volume of US soft drink consumption</a></li> <li>Volume of<span class="tight"> [US or world]</span> milk consumption</li> <li>Volume of<span class="tight"> [US, British, or world]</span> gin consumption</li> <li><a href="https://hypertextbook.com/facts/2005/ZoeAnnGilroy.shtml">Volume of vodka consumption</a></li> <li><a href="https://hypertextbook.com/facts/2002/DanielRuderfer.shtml">Volume of US whiskey consumption</a></li> <li><a href="https://hypertextbook.com/facts/2002/MaryVernov.shtml">Volume of US rum consumption</a></li> <li><a href="https://hypertextbook.com/facts/2001/JohnnyAlicea.shtml">Volume of world beer consumption</a></li> <li><a href="https://hypertextbook.com/facts/2005/JeffreyGilbert.shtml">Volume of a swimming pool</a></li> <li><a href="https://hypertextbook.com/facts/2004/IlyaParizh.shtml">Volume of water in New York City reservoirs</a></li> <li>Volume of water in US reservoirs</li> <li><a href="https://hypertextbook.com/facts/2005/LauraDePalma.shtml">Volume of New York City's annual precipitation</a>*</li> <li><a href="https://hypertextbook.com/facts/2006/GinaCastellano.shtml">Volume of Seattle's annual precipitation</a></li> <li><a href="https://hypertextbook.com/facts/2008/VernonWu.shtml">Volume of earth's annual precipitation</a></li> <li><a href="https://hypertextbook.com/facts/2005/HamidaDaud.shtml">Volume of earth's lakes</a></li> <li><a href="https://hypertextbook.com/facts/2000/KerllyBernabe.shtml">Volume of earth's rivers</a>*</li> <li>Volume of earth's glaciers</li> <li><a href="https://hypertextbook.com/facts/2000/HannaBerenblit.shtml">Volume of earth's polar ice caps</a>*</li> <li><a href="https://hypertextbook.com/facts/2000/VanessaBallenas.shtml">Volume of earth's groundwater</a></li> <li><a href="https://hypertextbook.com/facts/2001/SyedQadri.shtml">Volume of earth's oceans</a>*</li> <li><a href="https://hypertextbook.com/facts/1997/HaiyanXie.shtml">Volume of US petroleum production</a></li> <li><a href="https://hypertextbook.com/facts/2000/TanyaAlbukh.shtml">Volume of US petroleum consumption</a></li> <li><a href="https://hypertextbook.com/facts/2000/SohailAhmed.shtml">Volume of US petroleum reserves</a>*</li> <li><a href="https://hypertextbook.com/facts/1999/DanielAshe.shtml">Volume of world petroleum production</a></li> <li><a href="https://hypertextbook.com/facts/2000/EvanAbel.shtml">Volume of world petroleum reserves</a></li> </ol> </li> </ol> <p>* entries marked with an asterisk include editor's commentary</p> </nav> <nav> <p> <a href="#acceleration"><span class="tight">acceleration</span><span class="loose"><i>a</i></span></a>, <a href="#angularvelocity"><span class="tight">angular‑velocity</span><span class="loose">ω</span></a>, <a href="#area"><span class="tight">area</span><span class="loose"><i>A</i></span></a>, <a href="#density"><span class="tight">density</span><span class="loose">ρ</span></a>, <a href="#dimension"><span class="tight">dimension</span><span class="loose"><i>D</i></span></a>, <a href="#current"><span class="tight">electric‑current</span><span class="loose"><i>I</i></span></a>, <a href="#efield"><span class="tight">electric‑field</span><span class="loose"><i>E</i></span></a>, <a href="#voltage"><span class="tight">electric‑voltage</span><span class="loose"><i>V</i></span></a>, <a href="#resistivity"><span class="tight">electrical‑resistivity</span><span class="loose">ρ</span></a>, <a href="#energy"><span class="tight">energy</span><span class="loose"><i>E</i></span></a>, <a href="#force"><span class="tight">force</span><span class="loose"><i>F</i></span></a>, <a href="#frequency"><span class="tight">frequency</span><span class="loose"><i>f</i></span></a>, <a href="#friction"><span class="tight">friction</span><span class="loose">μ</span></a>, <a href="#length"><span class="tight">length</span><span class="loose">ℓ</span></a>, <a href="#bfield"><span class="tight">magnetic‑field</span><span class="loose"><i>B</i></span></a>, <a href="#mass"><span class="tight">mass</span><span class="loose"><i>m</i></span></a>, <a href="#money"><span class="tight">money</span><span class="loose">$</span></a>, <a href="#number"><span class="tight">number</span><span class="loose">#</span></a>, <a href="#power"><span class="tight">power</span><span class="loose"><i>P</i></span></a>, <a href="#pressure"><span class="tight">pressure</span><span class="loose"><i>p</i></span></a>, <a href="#index"><span class="tight">refraction</span><span class="loose"><i>n</i></span></a>, <a href="#cor"><span class="tight">restitution</span><span class="loose"><i>cor</i></span></a>, <a href="#temperature"><span class="tight">temperature</span><span class="loose"><i>T</i></span></a>, <a href="#time"><span class="tight">time</span><span class="loose"><i>t</i></span></a>, <a href="#velocity"><span class="tight">velocity</span><span class="loose"><i>v</i></span></a>, <a href="#volume"><span class="tight">volume</span><span class="loose"><i>V</i></span></a> </p> </nav> </section> <footer> <div class="add add-yes"><div class="sharethis-inline-share-buttons"></div><span class="add-goo"><a href="#search"><img src="https://omniscientwalnut.com/search.svg" alt="search icon" title="Search this site"></a></span></div> </footer> </article> <footer> <nav> <ul> <li><a href="https://hypertextbook.com/facts/about/" target="_top" title="News, About, Links">prefaces</a></li> <li><a href="https://hypertextbook.com/facts/" target="_top" title="Topic Index">topics</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml" target="_top" title="Author Index">authors</a></li> <li><a href="https://hypertextbook.com/facts/index-special.shtml" target="_top" title="Special Projects">special</a></li> <li><a href="https://hypertextbook.com/facts/about/instructions.shtml" target="_top" title="Instructions to Students">instructions</a></li> </ul> </nav> <div class="signature"> <span><a href="https://hypertextbook.com" target="_top"><img src="https://omniscientwalnut.com/eglobe.svg" title="hypertextbook.com" alt="eglobe logo"></a></span> <span><a href="https://hypertextbook.com/facts/" target="_top" title="An encyclopedia of scientific essays">The Physics Factbook</a><br><a href="https://glennelert.us" target="_blank" title="Well, who are you? I really wanna know Tell me, who are you? 'Cause I really wanna know">Edited by Glenn Elert</a><br><a href="http://midwoodscience.org" title="Midwood Science : The Home of Midwood Science Research" target="_blank">Written by his students</a></a></span> </div> <p title="No condition is permanent">No condition is permanent.</p> <!-- A Delos Destination --> <nav> <ol> <li style="-webkit-column-break-before:avoid; break-before:avoid;" id="prefaces">Prefaces <ol> <li><a href="https://hypertextbook.com/facts/about/news.shtml" target="_top">What's new</a></li> <li><a href="https://hypertextbook.com/facts/about/" target="_top">About</a></li> <li><a href="https://hypertextbook.com/facts/about/links.shtml" target="_top">Links</a></li> <li><a href="https://hypertextbook.com/facts/about/fairuse.shtml" target="_top">Fair use</a></li> </ol> </li> <li style="-webkit-column-break-before:avoid; break-before:avoid;" id="instructions">Instructions <ol> <li><a href="https://hypertextbook.com/facts/about/assignments.shtml" rel="nofollow" target="_top">Assignments</a></li> <li><a href="https://hypertextbook.com/facts/about/instructions.shtml" rel="nofollow" target="_top">Instructions</a></li> <li><a href="https://hypertextbook.com/facts/about/cover.pdf" rel="nofollow" target="_blank">Cover page</a></li> <li><a href="https://hypertextbook.com/facts/about/generic.shtml" rel="nofollow" target="_top">Generic webpage</a></li> <li><a href="https://hypertextbook.com/facts/about/bibliography.shtml" rel="nofollow" target="_top">About bibliographies</a></li> <li style="margin-bottom:1.75em;"><a href="https://hypertextbook.com/facts/about/units.shtml" rel="nofollow" target="_top">About units</a></li> </ol> </li> <li style="-webkit-column-break-before:always; break-before:column;" id="topics">Topic index <ol> <li><a href="https://hypertextbook.com/facts/#acceleration">acceleration</a> <li><a href="https://hypertextbook.com/facts/#angularvelocity">angular velocity</a> <li><a href="https://hypertextbook.com/facts/#area">area</a> <li><a href="https://hypertextbook.com/facts/#density">density</a> <li><a href="https://hypertextbook.com/facts/#dimension">dimension</a> <li><a href="https://hypertextbook.com/facts/#current">electric current</a> <li><a href="https://hypertextbook.com/facts/#efield">electric field</a> <li><a href="https://hypertextbook.com/facts/#voltage">electric voltage</a> <li><a href="https://hypertextbook.com/facts/#resistivity">electrical resistivity</a> <li><a href="https://hypertextbook.com/facts/#energy">energy</a> <li><a href="https://hypertextbook.com/facts/#force">force</a> <li><a href="https://hypertextbook.com/facts/#frequency">frequency</a> <li><a href="https://hypertextbook.com/facts/#friction">friction</a> <li><a href="https://hypertextbook.com/facts/#length">length</a> <li><a href="https://hypertextbook.com/facts/#bfield">magnetic field</a> <li><a href="https://hypertextbook.com/facts/#mass">mass</a> <li><a href="https://hypertextbook.com/facts/#money">money</a> <li><a href="https://hypertextbook.com/facts/#number">number</a> <li><a href="https://hypertextbook.com/facts/#power">power</a> <li><a href="https://hypertextbook.com/facts/#pressure">pressure</a> <li><a href="https://hypertextbook.com/facts/#index">refraction</a> <li><a href="https://hypertextbook.com/facts/#cor">restitution</a> <li><a href="https://hypertextbook.com/facts/#temperature">temperature</a> <li><a href="https://hypertextbook.com/facts/#time">time</a> <li><a href="https://hypertextbook.com/facts/#velocity">velocity</a> <li style="margin-bottom:1.75em;"><a href="https://hypertextbook.com/facts/#volume">volume</a> </ol> </li> <li style="-webkit-column-break-before:always; break-before:column;" id="authors">Author index <ol> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#1997">1997</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#1998">1998</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#1999">1999</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2000">2000</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2001">2001</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2002">2002</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2003">2003</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2004">2004</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2005">2005</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2006">2006</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2007">2007</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2008">2008</a></li> <li><a href="https://hypertextbook.com/facts/index-authors.shtml#2009">2009</a></li> </ol> </li> <li style="-webkit-column-break-before:avoid; break-before:avoid;" id="special">Special topics <ol> <li><a href="https://hypertextbook.com/facts/index-special.shtml#2002">2002</a></li> <li><a href="https://hypertextbook.com/facts/index-special.shtml#2005">2005</a></li> <li><a href="https://hypertextbook.com/facts/index-special.shtml#2006">2006</a></li> <li style="margin-bottom:1.75em;"><a href="https://hypertextbook.com/facts/index-special.shtml#2007">2007</a></li> </ol> </li> <li style="-webkit-column-break-before:always; break-before:column;" id="contact">Contact the editor <ol> <li><a href="https://glennelert.us" rel="me" target="_blank">glennelert.us</a></li> <li><a href="https://www.behance.net/elert" rel="me" target="_blank">Behance</a></li> <li><a href="https://www.instagram.com/elert" rel="me" target="_blank">Instagram</a></li> <li><a href="https://www.twitter.com/glennelert" rel="me" target="_blank">Twitter</a></li> <li><a href="https://www.youtube.com/GlennElert" rel="me" target="_blank">YouTube</a></li> </ol> </li> <li style="-webkit-column-break-before:avoid; break-before:avoid;" id="affiliates">Affiliated websites <ol> <li><a href="https://physics.info" rel="me" title="The Physics Hypertextbook" target="_top">physics.info</a></li> <li><a href="http://midwoodscience.org/" rel="me" title="Midwood High School Science Research Program" target="_blank">midwoodscience.org</a></li> </ol> </li> </ol> </nav> <!-- Move to the window's forehead with jQuery. --> <script> $('html,body').delay(1000).animate({scrollTop: $('#forehead').offset().top },500); </script> </footer> </body> </html>