Every measurement depends on a reference standard. The metric system of measurement is a simple international system, because all units are based on 10 or more multiples of 10 so it is easy to convert one unit to another.
The International System of Units (SI), is a revised version of the metric system. There are seven SI based units. From these base units, other SI units of measurement can be derived, such as; volume, density and pressure.
SI Units:
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