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the si system of measurement is the standard set of units accepted throughout the world.
In engineering and science, a system of units called SI is used. The same units are used worldwide in most countries outside of the United States, except that in practice, some non-SI units are used as well (for example, hours and days instead seconds, and the degree Celsius instead of Kelvin).
Standard units are used for measurmen as there is a system called the SI units and that is considered as the international system of units that is why we use standard units for measurment .
The SI has 7 base units. These units can be combined in an almost unlimited way to form other (derived) units. The Wikipedia article on "SI derived units" lists some examples.