Actually the International System of Units (SI), the modern form of the metric system, is preferred for many uses by the U.S. National Institute of Standards and Technology (NIST).<p>[1] - <a href="http:&#x2F;&#x2F;www.nist.gov&#x2F;pml&#x2F;wmd&#x2F;metric&#x2F;index.cfm" rel="nofollow">http:&#x2F;&#x2F;www.nist.gov&#x2F;pml&#x2F;wmd&#x2F;metric&#x2F;index.cfm</a><p>[2] - <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;United_States_customary_units" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;United_States_customary_unit...</a>