Physics

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data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/jCqGiy7SSjwnOZMmBiy6x_ss098=/300x200/filters:no_upscale()/GettyImages-533592578-57e681ce3df78c690fb17ca4.jpg" alt="We think of temperature as a measure of hot or cold, but what we're really talking about is thermal energy." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Temperature Definition in Science</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-32" class="comp block block-small" data-doc-id="2699009" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/speed-2699009" data-ordinal="35"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/1dpL1-JnW2NgtfC5Y8XplBjSu5I=/300x200/filters:no_upscale()/valentino-rossi-215404_960_720-5945aae55f9b58d58adc5010.jpg" alt="motorcycle racing on track" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Definition of Speed in Physics</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-33" class="comp block block-small" data-doc-id="2699310" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/steady-state-theory-2699310" data-ordinal="36"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/cSmhGT9eSfluZn4fl82WQ6a842I=/300x200/filters:no_upscale()/GettyImages-1312269221-5962ffae5f9b583f180dd527.jpg" alt="Expanding universe" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Steady State Theory</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-34" class="comp block block-small" data-doc-id="2699439" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/idealized-models-an-introduction-2699439" data-ordinal="37"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/dS2meo0G2BCmY36v4QfmgGa5m04=/300x200/filters:no_upscale()/GettyImages-522936987-5839daac5f9b58d5b146d1b6.jpg" alt="An idealized model represents all of the important characteristics of a phenomenon, while removing distractions." class="lazyload block-img" 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data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/7mlPtaiOU4DR2m3NZdRPki89oHg=/300x200/filters:no_upscale()/169707839-56a72be63df78cf77292fc12.jpg" alt="Man jumping and leaving light streaks" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Potential energy</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-72" class="comp block block-small" data-doc-id="2698957" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/matter-definition-in-physical-sciences-2698957" data-ordinal="75"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/IVaHlL1iqIkNRxJLKmBvz6fN-kM=/300x200/filters:no_upscale()/GettyImages-141850004-57bc62163df78c8763ec9da9.jpg" alt="One good 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The top layer is purple, the next layer is amber, then clear, then a whitish liquid. 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Work</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden chunk"> <a id="block_3-0-145" class="comp block block-small no-image" data-doc-id="2698990" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/neutrino-2698990" data-ordinal="148"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Neutrino</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-146" class="comp block block-small no-image" data-doc-id="2699003" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/proton-2699003" data-ordinal="149"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Proton</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-147" class="comp block block-small no-image" data-doc-id="2699304" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/quantum-zeno-effect-2699304" data-ordinal="150"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Quantum Zeno Effect</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-148" class="comp block block-small no-image" data-doc-id="2698985" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/isochoric-process-2698985" data-ordinal="151"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Isochoric Process</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-149" class="comp block block-small no-image" data-doc-id="2699264" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/participatory-anthropic-principle-pap-2699264" data-ordinal="152"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Participatory Anthropic Principle (PAP)</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-150" class="comp block block-small" data-doc-id="2698949" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/density-of-common-substances-2698949" data-ordinal="153"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/FeF3Jv_8l9YeI6xk3517sy0hX5E=/300x200/filters:no_upscale()/GettyImages-107710952-5917736e5f9b586470797a03.jpg" alt="Ice Block" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Density of Common Substances</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-151" class="comp block block-small no-image" data-doc-id="2699018" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/vaporization-2699018" data-ordinal="154"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Vaporization</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-152" class="comp block block-small no-image" data-doc-id="2699125" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/brane-2699125" data-ordinal="155"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>brane</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-153" class="comp block block-small no-image" data-doc-id="2698998" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/plasma-2698998" data-ordinal="156"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 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href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/buoyancy-2698964" data-ordinal="159"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Buoyancy</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-157" class="comp block block-small no-image" data-doc-id="2698970" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/condensation-2698970" data-ordinal="160"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Condensation</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-158" class="comp block block-small no-image" data-doc-id="2698994" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/nuclear-fusion-2698994" data-ordinal="161"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Nuclear Fusion</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-159" class="comp block block-small no-image" data-doc-id="2699258" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/meissner-effect-2699258" data-ordinal="162"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Meissner Effect</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-160" class="comp block block-small no-image" data-doc-id="2699312" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/thermal-equilibrium-2699312" data-ordinal="163"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Thermal Equilibrium</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-161" class="comp block block-small" data-doc-id="2698878" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/newtons-law-of-gravity-2698878" data-ordinal="164"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/IaEIJQV8JHRncWK3dfDHJe1X7dE=/300x200/filters:no_upscale()/GettyImages-155382352-57a8e2e65f9b58974a5e7d62.jpg" alt="Newton did think about gravity watching apples fall from trees, but he didn't have a "eureka" moment by having on fall on his head. That's just not true!" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Newton's Law of Gravity</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-162" class="comp block block-small" data-doc-id="2698879" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/one-dimensional-kinematics-motion-straight-line-2698879" data-ordinal="165"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/Jya0vclT5OFuriiHEkFDZ5_Sy8s=/300x200/filters:no_upscale()/GettyImages-113260156-57d40cad3df78c58334a6645.jpg" alt="One-dimensional kinematics can be used to describe movement in a straight line." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>One-Dimensional Kinematics: Motion Along a Straight Line</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-163" class="comp block block-small" data-doc-id="2698880" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/two-dimensional-kinematics-motion-in-a-plane-2698880" data-ordinal="166"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/TGhdLsGnz46XeSgt5XsCqErGdhA=/300x200/filters:no_upscale()/GettyImages-545866779-57d411413df78c58334a6c9f.jpg" alt="Two-dimensional kinematics can be used to describe motion in a plane, such as throwing a football." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Two-Dimensional Kinematics: Motion in a Plane</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-164" class="comp block block-small" data-doc-id="2699379" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/the-michelson-morley-experiment-2699379" data-ordinal="167"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/Eqy76rodYCITCG0J4ozniKpP4w8=/300x200/filters:no_upscale()/interferometer-56a72bba5f9b58b7d0e7898f.png" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>History of the Michelson-Morley Experiment</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-165" class="comp block block-small" data-doc-id="2699380" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/moving-faster-than-speed-of-light-2699380" data-ordinal="168"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/KLJSExoaVUexRP8KgMxr8kzim8o=/300x200/filters:no_upscale()/GettyImages-175371277-5963242a5f9b583f180e18df.jpg" alt="City lights in Seattle" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Can Anything Move Faster Than the Speed of Light?</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-166" class="comp block block-small" data-doc-id="2698881" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/introduction-to-newtons-laws-of-motion-2698881" data-ordinal="169"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/PGZXWQjxSdG5-xl25u-aF5gEIk4=/300x200/filters:no_upscale()/GettyImages-154320249-59443d2d5f9b58d58a2a2efe.jpg" alt="Sir Isaac Newton" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Introduction to Newton's Laws of Motion</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-167" class="comp block block-small" data-doc-id="2699033" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/doppler-effect-in-light-red-shift-and-blue-shift-2699033" data-ordinal="170"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/4Jw2aksl1MYYNNfbYAtKOyOA1sQ=/300x200/filters:no_upscale()/GettyImages-168179261-5962f0f65f9b583f180dc5c6.jpg" alt="Redshift observation" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Doppler Effect in Light: Red & Blue Shift</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-168" class="comp block block-small no-image" data-doc-id="2699378" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/einsteins-theory-of-relativity-2699378" data-ordinal="171"> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Einstein's Theory of Relativity</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden chunk"> <a id="block_3-0-169" class="comp block block-small" data-doc-id="2698883" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/the-history-of-gravity-2698883" data-ordinal="172"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/DIf7a8_FlEt4J0EApevoUpiFQLM=/300x200/filters:no_upscale()/GettyImages-537251933-596e2f2b396e5a0011315a56.jpg" alt="People captured in mid air, while jumping on trampoline in big studio." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>The History of Gravity</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-170" class="comp block block-small" data-doc-id="2699370" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/quantum-physics-overview-2699370" data-ordinal="173"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/-RZHqWLMSKjuuIvKCa2cjqdsKZI=/300x200/filters:no_upscale()/quantum-physics-formulas-over-blackboard-187852370-579632175f9b58173bbafc77.jpg" alt="Quantum mechanics equations can be daunting, but the essential concepts are not difficult to understand." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Quantum Physics Overview</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-171" class="comp block block-small" data-doc-id="2699356" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/quantum-levitation-and-how-does-it-work-2699356" data-ordinal="174"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/XRSLB79a3FS5ELMozQlFxqn4qWY=/300x200/filters:no_upscale()/GettyImages-507882218-57af88f55f9b58b5c2edaba5.jpg" alt="Maglev trains, like this one in Shanhgai China, essentially fly or levitate because of the magnetic field." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>How Does Quantum Levitation Work?</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-172" class="comp block block-small" data-doc-id="2699363" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/what-is-string-theory-2699363" data-ordinal="175"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/RfgkCCudyEvZrKxQe_lQcVGGJNM=/300x200/filters:no_upscale()/GettyImages-499157257-56fd75565f9b586195c9dddc.jpg" alt="Colorful strings, depicting an artistic interpretation of string theory" class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>The Basics of String Theory</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-173" class="comp block block-small" data-doc-id="3862240" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/dirac-delta-function-3862240" data-ordinal="176"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/Lqn1d7mzZZgp_Le2YgIkqoA0y9k=/300x200/filters:no_upscale()/1300px-Dirac_distribution_PDF.svg-56aeb7423df78cf772bd6898.png" alt="A graph with a horizontal line. At a location of 0, there is a vertical line shown with a magnitude of 1." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>Dirac Delta Function</span></h2> </div> </a>  </li> <li class="g-item block-list-item is-hidden"> <a id="block_3-0-174" class="comp block block-small" data-doc-id="2699360" href="https://web.archive.org/web/20170930064522/https://www.thoughtco.com/what-is-quantum-gravity-2699360" data-ordinal="177"> <div class="block-media"><img data-src="https://web.archive.org/web/20170930064522/https://fthmb.tqn.com/ZXneCA0LK6aaN0g7o4Q1syQdHQo=/300x200/filters:no_upscale()/GettyImages-548000477-584301b05f9b5851e5385682.jpg" alt="According to the theory of quantum gravity, a virtual particle called a graviton mediates the gravitational force." class="lazyload block-img" src="/web/20170930064522im_/https://www.thoughtco.com/static/2.26.1/image/placeholder.png" data-expand="300"/> </div> <div class="block-content"> <p class="block-kicker">Article</p> <h2 class="block-title"><span>What Is Quantum Gravity? 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