Collection of units of measurement and rules relating them to each other

<span class="mw-page-title-main">System of measurement</span>

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System of measurement

<p>A <b>system of measurement</b> is a collection of <a href="/en/Units_of_measurement" title="Units of measurement" class="mw-redirect wl">units of measurement</a> and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of <a href="/en/Science" title="Science" class="wl">science</a> and <a href="/en/Commerce" title="Commerce" class="wl">commerce</a>. Systems of measurement in use include the <a href="/en/International_System_of_Units" title="International System of Units" class="wl">International System of Units</a> or <abbr about="#mwt5" typeof="mw:Transclusion mw:ExpandedAttrs" data-mw="{&quot;parts&quot;:[{&quot;template&quot;:{&quot;target&quot;:{&quot;wt&quot;:&quot;Abbr&quot;,&quot;href&quot;:&quot;./Template:Abbr&quot;},&quot;params&quot;:{&quot;1&quot;:{&quot;wt&quot;:&quot;SI&quot;},&quot;2&quot;:{&quot;wt&quot;:&quot;Système international&quot;}},&quot;i&quot;:0}}]}">SI</abbr> (the modern form of the <a href="/en/Metric_system" title="Metric system" class="wl">metric system</a>), the <a href="/en/British_imperial_system" title="British imperial system" class="mw-redirect wl">British imperial system</a>, and the <a href="/en/United_States_customary_system" title="United States customary system" class="mw-redirect wl">United States customary system</a>.</p>

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A system of measurement is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Systems of measurement in use include the International System of Units or SI , the British imperial system, and the United States customary system. 