BIPM - Appendix 1

<html> <head><script type="text/javascript" src="https://web-static.archive.org/_static/js/bundle-playback.js?v=7YQSqjSh" charset="utf-8"></script> <script type="text/javascript" src="https://web-static.archive.org/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="https://web-static.archive.org/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://www.bipm.org/en/publications/si-brochure/appendix1.html","20200528184144","https://web.archive.org/","web","https://web-static.archive.org/_static/", "1590691304"); </script> <link rel="stylesheet" type="text/css" href="https://web-static.archive.org/_static/css/banner-styles.css?v=p7PEIJWi" /> <link rel="stylesheet" type="text/css" href="https://web-static.archive.org/_static/css/iconochive.css?v=3PDvdIFv" />   <meta http-equiv="X-UA-Compatible" content="IE=8"/> <title>BIPM - Appendix 1</title> <meta name="description" content="BIPM internet site - "> <meta name="keywords" content=""> <script language="javascript" src="/web/20200528184144js_/https://www.bipm.org/utils/onLoad.js"> </script> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//web.archive.org/web/20200528184144/https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-38070491-1', 'auto'); ga('send', 'pageview'); </script> <script src="/web/20200528184144js_/https://www.bipm.org/utils/jquery/jquery-1.10.2.min.js"></script> <script src="/web/20200528184144js_/https://www.bipm.org/utils/jquery/jquery-ui-1.10.3.custom/js/jquery-ui-1.10.3.custom.js"></script> <script src="/web/20200528184144js_/https://www.bipm.org/utils/zee/unslider.min.js"></script> <script src="/web/20200528184144js_/https://www.bipm.org/utils/zee/slider.js"></script> <script src="/web/20200528184144js_/https://www.bipm.org/utils/zee/cookie.js"></script> <link rel="stylesheet" href="/web/20200528184144cs_/https://www.bipm.org/utils/jquery/jquery-ui-1.10.3.custom/css/smoothness/jquery-ui-1.10.3.custom.css"> <link rel="stylesheet" href="/web/20200528184144cs_/https://www.bipm.org/resources/demos/style.css"> <link rel="stylesheet" href="/web/20200528184144cs_/https://www.bipm.org/utils/typoZEE.css" type="text/css"> </head> <body bgcolor="#FFFFFF" leftmargin="0" rightmargin="0" topmargin="0" marginwidth="0" marginheight="0">  <a name="haut"> <center>  <table width="1000" cellspacing="0" cellpadding="2" border="0"> <tr> <td width="10"></td><td width="180"></td><td width="530"></td><td width="270"></td><td width="10"></td></tr> <tr height="90"> <td width="10"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="90"></td> <td width="180" valign="center" align="left"><a href="/web/20200528184144/https://www.bipm.org/en/about-us/" title="BIPM home page"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/logoBIPM-RB.jpg" border="0"></a></td> <td width="530" valign="center" align="center" class="intro">    the intergovernmental organization through which Member States act together<br>      on matters related to measurement science and measurement standards.</td> <td width="270" align="center" valign="top"> <script language="javascript"> function ActionForm(f) { f.q.style.background = "white"; } </script> <form name="search" action="https://web.archive.org/web/20200528184144/https://search.bipm.org/bipm/en/C="> <table width="180" align="right" valign="top" border="0"> <tr height="50"> <td valign="bottom" class="intro">Search facility: <input onclick="ActionForm(this.form)" style="vertical-align: middle;background-image:url(/web/20200528184144im_/https://www.bipm.org/utils/en/img/bipm_portal.gif); background-repeat:no-repeat; background-position:center right;" type="text" name="q" size="25" maxlength="50"> <input type="hidden" name="action" value="s"> <input type="hidden" name="setcontext" value=""> </td> <td height="25" colspan="2" width="50" valign="bottom" align="left"><input type="image" src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/exalead.gif" border="0"></td> </tr> </table> </form> <br> <br> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="270" height="15" border="0"> <nobr><a href="/web/20200528184144/https://www.bipm.org/en/about-us/"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/home.png" border="0"></a> | <a class="navigation" href="/web/20200528184144/https://www.bipm.org/en/about-us/map.html">Site map</a> | <a class="navigation" href="/web/20200528184144/https://www.bipm.org/en/news/">News</a> | <a class="navigation" href="javascript:hidden_email('webmaster','bipm.org','BIPM website');">Contact us</a> | [<a href="/web/20200528184144/https://www.bipm.org/fr/publications/si-brochure/appendix1.html" class="GrosTitreVO"> FR </a>] </nobr> </td> <td width="10"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="90"></td> </tr> </table>   <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr> <td nowrap width="100%"> <style media="all" type="text/css"></style> <div class="menu"> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/" target="_self">  About us</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/role.html" target="_self">Our role and objectives</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/governance/" target="_self">Governance</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/member-states/" target="_self">Member States</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/associates/" target="_self">Associates</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/" target="_self">International System of Units (SI)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/" target="_self">International equivalence of measurements<br>(CIPM MRA)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/" target="_self">Our committees</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/" target="_self">Our work programme</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/sections/" target="_self">The BIPM staff</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/vacancies/" target="_self">Jobs and Secondments</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/procurement/" target="_self">Procurement and Sales</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/directions/" target="_self">How to get to the BIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/about-us/pavillon-de-breteuil/" target="_self">History of the Pavillon de Breteuil</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/" target="_self"> Worldwide metrology</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/" target="_self">What is metrology?</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/" target="_self">International equivalence of measurements<br>(CIPM MRA)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/metre-convention/" target="_self">The Metre Convention</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/cgpm/" target="_self">The General Conference (CGPM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/" target="_self">The International Committee (CIPM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/" target="_self">CIPM Consultative Committees (CCs)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/national/" target="_self">National Metrology Institutes (NMIs)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/regional/" target="_self">Regional Metrology Organizations (RMOs)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/jc/" target="_self">Joint Committees</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/liaisons/" target="_self">BIPM liaison work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cbkt/" target="_self">BIPM Capacity Building & Knowledge Transfer Programme</a></li> <li><a href="https://web.archive.org/web/20200528184144/http://www.worldmetrologyday.org/" target="_blank">World Metrology Day</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/" target="_self"> International equivalence</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/" target="_self">What is the CIPM MRA?</a></li> <li><a href="https://web.archive.org/web/20200528184144/https://www.bipm.org/kcdb" target="_self">CIPM MRA database <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img2/logo_kcdb_pt.gif"></a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/participation/" target="_self">Participating laboratories</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/cipm-mra-documents/" target="_self">CIPM MRA documents</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/approval-process.html" target="_self">CMC approval process</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cipm-mra/logo/" target="_self">Use of the CIPM MRA logo</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/jc/jcrb/" target="_self">JCRB: Joint Committee of the RMOs and the BIPM</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/" target="_self"> SI units</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/" target="_self">The International System of Units (SI)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/appendix1.html" target="_self">Decisions of the CGPM and the CIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/mises-en-pratique/" target="_self">How to realize the definitions in practice</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/base-units.html" target="_self">Unit definitions</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/prefixes.html" target="_self">SI prefixes</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/si-download-area/" target="_self">Revised SI: Download area</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/history-si/" target="_self">Brief history of the SI</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/" target="_self"> Services</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/comparisons/" target="_self">Comparisons piloted by the BIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/calibrations/" target="_self">Calibration and measurement services</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/tai/" target="_self">Timescales</a></li> <li><a href="https://web.archive.org/web/20200528184144/https://www.bipm.org/kcdb" target="_self"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img2/logo_kcdb_pt.gif" alt="KCDB" vspace="2"></a></li> <li><a href="https://web.archive.org/web/20200528184144/https://www.bipm.org/jctlm/" target="_self"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img2/logo_jctlm_pt.gif" alt="JCTLM" vspace="2"></a></li> <li><a href="https://web.archive.org/web/20200528184144/http://imrr.bipm.org/" target="_self"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img2/logo_imrr_pt.gif" alt="IMRR" vspace="2"></a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="https://web.archive.org/web/20200528184144/http://iopscience.iop.org/0026-1394/" target="metrologia"><i>Metrologia</i></a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/" target="_self">Meetings</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/ionizing/radionuclides/sir/" target="_self">International Reference System (SIR)</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/" target="_self"> Publications</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/mises-en-pratique/" target="_self"><i>Mises en pratique</i></a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/directors-report/" target="_self">Annual Director's Report</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/publications-cipm.html#ra" target="_self">Financial Report</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/publications-cipm.html#no" target="_self">Notification of Contributions</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/" target="_self">Official proceedings</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/cgpm/resolutions.html" target="_self">Resolutions of the General Conference</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/open-literature/" target="_self">Scientific output</a></li> <li><a href="https://web.archive.org/web/20200528184144/http://iopscience.iop.org/0026-1394/" target="metrologia"><i>Metrologia</i></a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/guides/" target="_self">Guides in Metrology</a></li> </ul> </li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/diary/" target="_self"> Meetings</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/diary/" target="_self">List of meetings</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/" target="_self">BIPM Conference Centre</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/directions/" target="_self">How to get to the BIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/cgpm-2018/" target="_self">General Conference (CGPM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/" target="_self">International Committee (CIPM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/" target="_self">Consultative Committees and Working Groups</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/bipm-workshops/" target="_self">BIPM Workshops</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/other-events/" target="_self">Other BIPM events</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/" target="_self">Meeting reports</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/metrology-events.html" target="_self">External events</a></li> </ul> </li> </ul> </div> </td> </tr> </table>    <center> <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="10" height="50"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="50"></td> <td align="left" width="100%" height="50" background="/web/20200528184144im_/https://www.bipm.org/utils/common/img/cadre_trait.gif"> <table width="100%" border="0" background="/web/20200528184144im_/https://www.bipm.org/en/publications/si-brochure/appendix1.html"> <tr> <td align="left" class="GrosTitre"><div name="exalead-titre">SI Brochure: The International System of Units (SI)</div></td> </tr> </table> </td> <td width="10" height="50"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="50"></td> </tr> </table> </center>  <script> $(function() { $( "#tabs" ).tabs(); $( "#accordion" ).accordion({ heightStyle: "content", }); }); </script> <script language="JavaScript"> function GoToURL(formURL) { x = formURL.publication.selectedIndex if ( x == -1 ) { alert ("Nothing Selected") } else { location.href = formURL.publication.options[x].value } } </script>  <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr valign="top"> <td width="10"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> <td width="100%" align="left" class="txt12pt"> <div name="exalead">  <div id="tabs"> <ul> <li><a href="#key-decisions"><b>Appendix 1: Decisions of the CGPM and the CIPM</b></a></li> <li><a href="#chronological">Chronological list</a></li> <li><a href="si-brochure"><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/">SI Brochure (9th edition)</a></a></li> </ul> <div id="chronological"> <table bgcolor="#829EBA" border="0" cellpadding="5"> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 1st CGPM, 1889</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/1/1/">Sanction of the international prototypes of the metre and the kilogram</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 3rd CGPM, 1901</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/3/1/">Declaration concerning the definition of the litre</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 3rd CGPM, 1901</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/3/2/">Declaration on the unit of mass and on the definition of weight; conventional value of <i>g</i><sub>n</sub></a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 7th CGPM, 1927</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/7/1/">Definition of the metre by the international Prototype</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1946</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1946/0/">Definition of photometric units</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1946</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1946/2/">Definitions of electric units</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 9th CGPM, 1948</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/3/">Triple point of water; thermodynamic scale with a single fixed point; unit of quantity of heat (joule)</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> CGPM, 1948</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/cipm-1948.html">Adoption of "degree Celsius"</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 9th CGPM, 1948</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/6/">Proposal for establishing a practical system of units of measurement</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 9th CGPM, 1948</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/7/">Writing and printing of unit symbols and of numbers</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 10th CGPM, 1954</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/10/3/">Definition of the thermodynamic temperature scale</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 10th CGPM, 1954</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/10/4/">Definition of the standard atmosphere</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 10th CGPM, 1954</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/10/6/">Practical system of units</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1956</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1956/1/">Definition of the unit of time (second)</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1956</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1956/3/">Syst鑝e International d'Unit閟</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 11th CGPM, 1960</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/6/">Definition of the metre</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 11th CGPM, 1960</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/9/">Definition of the unit of time (second)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 11th CGPM, 1960</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/12/">Syst鑝e International d'Unit閟</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 11th CGPM, 1960</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/13/">Cubic decimetre and litre</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1961</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1961/0/">Cubic decimetre and litre</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1964</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1964/0/">Atomic and molecular frequency standards</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 12th CGPM, 1964</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/5/">Atomic standard of frequency</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 12th CGPM, 1964</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/6/">Litre</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 12th CGPM, 1964</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/7/">Curie</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 12th CGPM, 1964</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/8/">SI prefixes femto and atto</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1967</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1967/2/">Decimal multiples and submultiples of the unit of mass</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/1/">SI unit of time (second)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/3/">SI unit of thermodynamic temperature (kelvin)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/4/">Definition of the SI unit of thermodynamic temperature (kelvin)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/5/">SI unit of luminous intensity (candela)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/6/">SI derived units</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 13th CGPM, 1967/68</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/7/">Abrogation of earlier decisions (micron, new candle)</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1969</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1969/1/">Syst鑝e International d'Unit閟, Rules for application of Resolution 12 of the 11th CGPM (1960)</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> CCDS, 1970</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/committees/cc/cctf/ccds-1970.html">Definition of TAI</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> CGPM, 1971</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/convention/cgpm/14/pascal-siemens.html">Pascal and siemens</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 14th CGPM, 1971</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/14/1/">International Atomic Time, function of CIPM</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 14th CGPM, 1971</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/14/3/">SI unit of amount of substance (mole)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 15th CGPM, 1975</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/2/">Recommended value for the speed of light</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 15th CGPM, 1975</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/5/">Coordinated Universal Time (UTC)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 15th CGPM, 1975</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/8/">SI units for ionizing radiation: becquerel</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 15th CGPM, 1975</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/9/">SI units for ionizing radiation: gray</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 15th CGPM, 1975</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/10/">SI prefixes peta and exa</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 16th CGPM, 1979</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/3/">SI unit of luminous intensity (candela)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 16th CGPM, 1979</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/5/">Special name for the SI unit of dose equivalent (sievert)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 16th CGPM, 1979</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/6/">Symbols for the litre</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1980</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1980/1/">SI supplementary units (radian and steradian)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 17th CGPM, 1983</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/17/1/">Definition of the metre</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 17th CGPM, 1983</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/17/2/">On the realization of the definition of the metre</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1984</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1984/1/">Concerning the sievert</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 18th CGPM, 1987</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/18/6/">Forthcoming adjustment to the representations of the volt and of the ohm</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1988</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1988/1/">Representation of the volt by means of the Josephson effect</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1988</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1988/2/">Representation of the ohm by means of the quantum Hall effect</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 1989</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1989/5/">The International Temperature Scale of 1990</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 19th CGPM, 1991</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/19/4/">SI prefixes zetta, zepto, yotta and yocto</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 20th CGPM, 1995</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/20/8/">Elimination of the class of supplementary units in the SI</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 21st CGPM, 1999</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/21/7/">The definition of the kilogram</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 21st CGPM, 1999</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/21/12/">Special name for the SI derived unit mole per second, the katal, for the expression of catalytic activity</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> CIPM, 2000</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/cipm-2000.html">"Use of the von Klitzing constant to express the value of a reference standard of resistance as a function of the quantum Hall effect"</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> CIPM, 2001</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/cipm-2001.html">"SI units" and "units of the SI"</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2002</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2002-1-EN.pdf">Revision of the practical realization of the definition of the metre</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2002</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/2002/2/">Dose equivalent</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2003</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/2003/1/">Revision of the <i>Mise en Pratique</i> list of recommended radiations</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 22nd CGPM, 2003</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/22/10/">Symbol for the decimal marker</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2005</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2005-2-EN.pdf">Clarification of the definition of the kelvin, unit of thermodynamic temperature</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2005</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2005-3-EN.pdf">Revision of the <i>Mise en pratique</i> list of recommended radiations</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2006</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2006-1-EN.pdf">Concerning secondary representations of the second</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2007</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2007-1-EN.pdf">Revision of the <i>Mise en pratique</i> list of recommended radiations</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 23rd CGPM, 2007</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/23/9/">On the revision of the mise en pratique of the definition of the metre and the development of new optical frequency standards</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 23rd CGPM, 2007</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/23/10/">Clarification of the definition of the kelvin, unit of thermodynamic temperature</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 23rd CGPM, 2007</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/23/12/">On the possible redefinition of certain base units of the International System of Units (SI)</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2009</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2009-2-EN.pdf">Updates to the list of standard frequencies</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 24th CGPM, 2011</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/24/1/">On the possible future revision of the International System of Units, the SI</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 24th CGPM, 2011</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/24/8/">On the revision of the mise en pratique of the metre and the development of new optical frequency standards</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2013</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CI-2013-1-EN.pdf">Updates to the list of standard frequencies</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 25th CGPM, 2014</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/25/1/">On the future revision of the International System of Units, the SI</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2015</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CIPMOutcomes/CI-2015-Recommendation-2.pdf">Updates to the list of standard frequencies</a></td></tr> <tr><td valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="DBE3EB" valign="top"><span class="intro"> CIPM, 2017</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/meeting/106.html">On progress towards the possible redefinition of the SI (Decision CIPM/106-10)</a></td></tr> <tr><td width="20" valign="top"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif"></td><td bgcolor="#DBE3EB" valign="top"><span class="intro"> 26th CGPM, 2018</span><br/> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="25" height="10"><a class="introGras" href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/26/1/">On the revision of the International System of Units (SI)</a></td></tr> </table> <div class="txt11ptr">[Updated 2019]</div> </div> <div id="key-decisions"> <center><table width="90%" border="0" cellspacing="2" cellpadding="15" bgcolor="#829EBA"><tr><td bgcolor="#FFFFFF"><p><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/fleche_jaune.gif" width="29" height="14" alt="">This appendix lists those decisions of the <a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/cgpm/" class="introGras">CGPM</a> and the <a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/" class="introGras">CIPM</a> that bear directly upon definitions of the units of the SI, prefixes defined for use as part of the SI, and conventions for the writing of unit symbols and numbers. It is not a complete list of CGPM and CIPM decisions. For a complete list, reference must be made to: <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/cgpm/resolutions.html" class="introGras">the BIPM website</a>,</li> <li>successive volumes of the <a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/cgpm/resolutions.html#comptes-rendus" class="introGras"><i>Comptes Rendus des Séances de la Conférence Générale des Poids et Mesures</i> (CR)</a> and <a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/publications-cipm.html#pv" class="introGras"><i>Procès-Verbaux des Séances du Comité International des Poids et Mesures</i> (PV)</a> or,</li> <li><a href="https://web.archive.org/web/20200528184144/http://iopscience.iop.org/0026-1394/" class="introGras">for recent decisions, to <i>Metrologia</i></a>.</li></ul></p></td></tr></table></center> <p>Since the SI is not a static convention, but evolves following developments in the science of measurement, some decisions have been abrogated or modified; others have been clarified by additions. In the SI brochure, a number of notes have been added by the BIPM to make the text more understandable; they do not form part of the original text.</p> <p>The "Chronological list" tab above gives access to the decisions of the CGPM and CIPM in chronological order. In order to make it easy to locate decisions related to particular topics a table of contents is included below, ordered by subject:</p> <br> <div id="accordion"> <h3><b>Establishment of the SI</b></h3> <div> <table width="100%" bgcolor="#829EBA" border="0" cellpadding="5" class="txt11ptl"> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td width="110" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/6/" class="intros">9th CGPM, 1948</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/6/" class="intros"> decision to establish the SI</a></td> </tr> <tr> <td valign="top" class="cadreTrt"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/10/6/" class="intros">10th CGPM, 1954</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/10/6/" class="intros">decision on the first six base units</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1956/3/" class="intros">CIPM, 1956</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1956/3/" class="intros"> decision to adopt the name "Système International d'Unités"</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""> </td> <td valign="top" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/12/" class="intros">11th CGPM, 1960</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/12/" class="intros">confirms the name and the abbreviation "SI",<br/> names prefixes from tera to pico,<br/> established the supplementary units rad and sr,<br/> lists some derived units</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1969/1/" class="intros">CIPM, 1969</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1969/1/" class="intros">declaration concerning base, supplementary, derived and coherent units, and the use of prefixes</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td valign="top" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/committees/cipm/cipm-2001.html" class="intros">CIPM, 2001</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1969/1/" class="intros"> "SI units" and "units of the SI"</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td valign="top" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/23/12/" class="intros">23rd CGPM, 2007</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/23/12/" class="intros">possible redefinition of certain base units of the International System of Units, the SI</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/24/1/" class="intros">24th CGPM, 2011</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/24/1/" class="intros">possible future revision of the International System of Units, the SI</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/25/1/" class="intros">25th CGPM, 2014</a></td> <td class="intro" bgcolor="#DBE3EB"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/25/1/" class="intros">future revision of the International System of Units, the SI</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/26/1/" class="intros">26th CGPM, 2018</a></td> <td bgcolor="#DBE3EB" class="intro">revision of the International System of Units, the SI</td> </tr> </table> </div> <h3><b>Base units of the SI</b></h3> <div> <ul> <li class="introGrasGauche">Decisions of the CGPM and the CIPM relating to the base units of the SI: <ul> <li><a href="appendix1-length.html" class="introGras">Length</a></li> <li><a href="appendix1-mass.html" class="introGras">Mass</a></li> <li><a href="appendix1-time.html" class="introGras">Time</a></li> <li><a href="appendix1-electrical.html" class="introGras">Electrical units</a></li> <li><a href="appendix1-thermodynamic-temperature.html" class="introGras">Thermodynamic temperature</a></li> <li><a href="appendix1-amount-of-substance.html" class="introGras">Amount of substance</a></li> <li><a href="appendix1-luminous-intensity.html" class="introGras">Luminous intensity</a></li> </ul></li> </ul> </div> <h3><b>SI derived and supplementary units</b></h3> <div> <p class="txt12ptg">SI derived units:</p> <table width="100%" bgcolor="#829EBA" border="0" cellpadding="5" class="txt11ptl"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/7/" class="intros">12th CGPM, 1964</a></td> <td bgcolor="#DBE3EB" class="intro"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/7/" class="intros">accepts the continued use of the curie as a non-SI unit</a></td> </tr> <tr> <td width="20" valign="top" class="cadreTrt"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/6/" class="intros">13th CGPM, 1967/68</a></td> <td bgcolor="#DBE3EB" class="intro"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/6/" class="intros">lists some examples of derived units</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/8/" class="intros">15th CGPM, 1975</a></td> <td bgcolor="#DBE3EB" class="intro"> adopts the special names <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/8/" class="intros">becquerel, Bq</a>, and <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/9/" class="intros">gray, Gy</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""> </td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/5/" class="intros">16th CGPM, 1979</a></td> <td bgcolor="#DBE3EB" class="intro"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/5/" class="intros">adopts the special name sievert, Sv </a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1984/1/" class="intros">CIPM, 1984</a></td> <td bgcolor="#DBE3EB" class="intro"> <a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1984/1/" class="intros">decides to clarify the relationship between absorbed dose (SI unit gray) and dose equivalent (SI unit sievert)</a></td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/2002/2/" class="intros">CIPM, 2002</a></td> <td bgcolor="#DBE3EB" class="intro"> <a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/2002/2/" class="intros">modifies the relationship between absorbed dose and dose equivalent</a></td> </tr> </table> <br/> <p class="txt12ptg">Supplementary units:</p> <table width="100%" bgcolor="#829EBA" border="0" cellpadding="5" class="txt11ptl"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td width="120" bgcolor="#DBE3EB" class="txt11ptl" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1980/1/" class="intros">CIPM, 1980</a></td> <td class="intro" bgcolor="#DBE3EB"> <a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1980/1/" class="intros">decides to interpret supplementary units as dimensionless derived units</a></td> </tr> <tr> <td bgcolor="#829EBA" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td class="txt11ptl" bgcolor="#DBE3EB" valign="top"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/20/8/" class="intros">20th CGPM, 1995</a></td> <td class="intro" bgcolor="#DBE3EB"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/20/8/" class="intros">decides to abrogate the class of supplementary units, and confirms the CIPM interpretation that they are dimensionless derived units</a></td> </tr> </table> </div> <h3><b>Terminology and the acceptance of units for use with the SI</b></h3> <div> <p class="txt12ptg">SI prefixes:</p> <table width="100%" bgcolor="#829EBA" border="0" cellpadding="5"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"></td> <td width="120" bgcolor="#DBE3EB" class="txt11ptl"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/8/" class="intros">12th CGPM, 1964</a></td> <td bgcolor="#DBE3EB" class="intro"> decides to add femto and atto to the list of prefixes</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/15/10/" class="intros">15th CGPM, 1975</a></td> <td bgcolor="#DBE3EB" class="intro"> decides to add peta and exa to the list of prefixes</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl"><a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/19/4/" class="intros">19th CGPM, 1991</a></td> <td bgcolor="#DBE3EB" class="intro"> decides to add zetta, zepto, yotta and yocto to the list of prefixes</td> </tr> </table> <p class="txt12ptg">Unit symbols and numbers:</p> <table width="100%" bgcolor="#829EBA" cellpadding="5" border="0"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18" alt=""></td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/9/7/" class="intros">9th CGPM, 1948</a></td> <td bgcolor="#DBE3EB" class="intro">decides rules for printing unit symbols</td> </tr> </table> <p class="txt12ptg">Unit names:</p> <table width="100%" bgcolor="#829EBA" cellpadding="5" border="0"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/13/7/" class="intros">13th CGPM, 1967/68</a></td> <td bgcolor="#DBE3EB" class="intro">abrogates the use of the micron and new candle as units accepted for use with the SI</td> </tr> </table> <p class="txt12ptg">The decimal marker:</p> <table width="100%" bgcolor="#829EBA" cellpadding="5" border="0"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/22/10/" class="intros">22nd CGPM, 2003</a></td> <td bgcolor="#DBE3EB" class="intro">decides to allow the use of the point or the comma on the line as the decimal marker</td> </tr> </table> <p class="txt12ptg">Units accepted for use with the SI: an example, the litre:</p> <table width="100%" bgcolor="#829EBA" cellpadding="5" border="0"> <tr> <td width="20" valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" width="120" class="txt11ptl" valign="top"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/3/1/" class="intros">3rd CGPM, 1901</a></td> <td bgcolor="#DBE3EB" class="intro">defines the litre as the volume of 1 kg of water</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/11/13/" class="intros">11th CGPM, 1960</a></td> <td bgcolor="#DBE3EB" class="intro">requests the CIPM to report on the difference between the litre and the cubic decimetre</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"> <a href="/web/20200528184144/https://www.bipm.org/en/CIPM/db/1961/0/" class="intros">CIPM, 1961</a></td> <td bgcolor="#DBE3EB" class="intro">recommends that volume be expressed in SI units and not in litres</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/12/6/" class="intros">12th CGPM, 1964</a></td> <td bgcolor="#DBE3EB" class="intro">abrogates the former definition of the litre,<br/> recommends that litre may be used as a special name for the cubic decimetre</td> </tr> <tr> <td valign="top"> <img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/flc_dir.gif" width="18" height="18"> </td> <td bgcolor="#DBE3EB" class="txt11ptl" valign="top"> <a href="/web/20200528184144/https://www.bipm.org/en/CGPM/db/16/6/" class="intros">16th CGPM, 1979</a></td> <td bgcolor="#DBE3EB" class="intro">decides, as an exception, to allow both l and L as symbols for the litre</td> </tr> </table> </div> </div> </div>  </div> </td> <td width="10" bgcolor="#FFFFFF"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> <td width="160" bgcolor="#829EBA" valign="top"><center><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/si_petit.jpg" width="150" height="216" alt="" border="0"></a></center></td> <td width="10"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10"></td> </tr> <tr> <td height="5" colspan="5"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="10" height="5"></td> </tr> </table>   <table width="100%" bgcolor="#D3B657"> <tr> <td width="15%"></td> <td width="1000"> <table width="1000" border="0" cellspacing="0" cellpadding="0"> <tr> <td nowrap width="100%"> <style media="all" type="text/css"></style> <div class="menu3"> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/worldwide-metrology/" target="_self">Metrology area:</a></li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/auv/" target="_self">AUV</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/auv/" target="_self">Metrology in the field of Acoustics, Ultrasound and Vibration</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccauv/" target="_self">Committee structure (CCAUV)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/auv/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/" target="_self">Units (SI Brochure)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/gpanfilo.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/electricity-magnetism/" target="_self">EM</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/electricity-magnetism/" target="_self">Metrology in the field of Electricity and Magnetism</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccem/" target="_self">Committee structure (CCEM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/electricity-magnetism/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/electricity-magnetism/units.html" target="_self">Units for electrical quantities</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/electricity/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/comparisons/#PM" target="_self">Ongoing BIPM comparisons</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/calibrations/#electricity" target="_self">BIPM calibrations of electrical standards</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/electricity-magnetism/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/mstock.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/length/" target="_self">L</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/length/" target="_self">Length Metrology</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccl/" target="_self">Committee structure (CCL)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/length/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/length/units.html" target="_self">Unit of length (metre)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/gpanfilo.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/mass/" target="_self">M</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/mass/" target="_self">Mass Metrology</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccm/" target="_self">Committee structure (CCM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/mass/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/mass/units.html" target="_self">Unit of mass (kilogram)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/mass/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/mass/calibrations_mass/" target="_self">Calibration services</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/mass/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/mass/contact.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/photometry-radiometry/" target="_self">PR</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/photometry-radiometry/" target="_self">Metrology in the field of Photometry and Radiometry</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccpr/" target="_self">Committee structure (CCPR)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/utils/en/pdf/CCPR-strategy-document.pdf" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/photometry-radiometry/units.html" target="_self">Photometric units</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/photometry-radiometry/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/jviallon.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/" target="_self">QM</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/" target="_self">Metrology in the field of Chemistry and Biology</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccqm/" target="_self">Committee structure (CCQM)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/units.html" target="_self">Unit for amount of substance (mole)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/chemistry/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/comparisons/#QM" target="_self">Comparisons piloted by the BIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/calibrations/#chemistry" target="_self">BIPM calibrations: National ozone standards</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/chemistry-biology/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/rwielgosz.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/" target="_self">RI</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/" target="_self">Metrology in the field of Ionizing Radiation</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccri/" target="_self">Committee structure (CCRI)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/units.html" target="_self">SI units</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/ionizing/radionuclides/sir/" target="_self">International Reference System (SIR)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/ionizing/" target="_self">BIPM laboratory work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/comparisons/#RI" target="_self">Ongoing BIPM comparisons</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/calibrations/#ionizing-radiation" target="_self">BIPM calibrations: Ionization chambers</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/publications.html" target="_self">BIPM publications in the scientific literature</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/scientific-output/monographies-ri.html" target="_self"><i>Monographies</i> BIPM</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/ionizing-radiation/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/steven.judge.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/thermometry/" target="_self">T</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/thermometry/" target="_self">Metrology in Thermometry</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/cct/" target="_self">Committee structure (CCT)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/thermometry/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/thermometry/units.html" target="_self">SI base unit (kelvin)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/susanne.picard.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/" target="_self">TF</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/" target="_self">Time and Frequency Metrology</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/cctf/" target="_self">Committee structure (CCTF)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/#strategy" target="_self">Strategic plan</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/timescales/time-server.html" target="_self">What time is it?</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/timescales/" target="_self">Timescales</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/units.html" target="_self">Unit of time (second)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/mises-en-pratique/standard-frequencies.html" target="_self">Recommended values of standard frequencies</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/tai/" target="_self">BIPM technical work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/jsp/en/TimeCalibrations.jsp" target="_self">BIPM calibrations for time transfer</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/publications.html" target="_self">BIPM technical publications</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/tai/annual-report.html" target="_self">BIPM Annual Report on Time Activities</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm-services/timescales/time-ftp.html" target="_self">FTP server of the BIPM Time Department</a></li> <li><a href="https://web.archive.org/web/20200528184144/http://webtai.bipm.org/database/html/" target="_self">Time Department Database</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/time-frequency/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/patrizia.tavella.html" target="_self">BIPM contact</a></li> </ul> </li> <li><a id="" href="/web/20200528184144/https://www.bipm.org/en/measurement-units/" target="_self">U</a> <ul> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/" target="_self">Measurement units: the International System (SI)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/publications/si-brochure/" target="_self">SI Brochure</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/#si-base-units" target="_self">SI base units</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/measurement-units/#prefixes" target="_self">SI prefixes</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/committees/cc/ccu/" target="_self">Consultative Committee for Units (CCU)</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/metrology/units/liaisons.html" target="_self">BIPM liaison and coordination work</a></li> <li><a href="https://web.archive.org/web/20200528184144/http://physics.nist.gov/cuu/Constants/index.html" target="new">CODATA recommended values of the Fundamental Physical Constants</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/extra/codata-tgfc/" target="_self">CODATA Task Group on Fundamental Constants</a></li> <li><a href="/web/20200528184144/https://www.bipm.org/en/bipm/people/estefania.de.mirandes.html" target="_self">BIPM contact</a></li> </ul> </li> </ul> </div> </td> </tr> </table> </td> <td width="15%"></td> </tr> </table>   <table width="100%" bgcolor="#193B7F" alt="mid blue"><tr><td> <center> <table width="1000" bgcolor="#193B7F" border="0" cellspacing="0" cellpadding="0"> <tr height="60"> <td width="20"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="20" height="60" alt=""></td> <td width="470"><div align="left"><a href="/web/20200528184144/https://www.bipm.org/en/conference-centre/directions/" class="navigationBlanc">BIPM - Pavillon de Breteuil F-92312 Sèvres Cedex FRANCE</a></div></td> <td width="100" class="navigationBlanc"><center><a href="/web/20200528184144/https://www.bipm.org/en/about-us/disclaimer.html" class="navigationBlanc">Disclaimer</a><br><a href="/web/20200528184144/https://www.bipm.org/en/about-us/privacy-policy.html" class="navigationBlanc">Privacy Policy</a></center></td> <td width="410"><div align="right"><a href="/web/20200528184144/https://www.bipm.org/en/about-us/disclaimer.html" class="navigationBlanc">Copyright © BIPM all rights reserved</a></div></td> <td width="20"><img src="/web/20200528184144im_/https://www.bipm.org/utils/common/img/pix.gif" width="20" height="60" alt=""></td> </tr> </table> </center> </td></tr></table>  </body> </html>

CINXE.COM

BIPM - Appendix 1