Changes

The [[International System of Units]] borrows some definitions and concepts from the metric system--most notably the meter and the kilogram--and adds other definitions of other quantities, most notably [[time]], [[force]], [[amount of substance]], plane [[angle]], solid angle, and [[luminous intensity]]. The liter ''is not'' the unit of volume in that system, however, but liter is accepted for use with the SI.

The [[International System of Units]] borrows some definitions and concepts from the metric system--most notably the meter and the kilogram--and adds other definitions of other quantities, most notably [[time]], [[force]], [[amount of substance]], plane [[angle]], solid angle, and [[luminous intensity]]. The liter ''is not'' the unit of volume in that system, however, but liter is accepted for use with the SI.

In addition to the International System (or in French, ''Systèm International'', or SI for short), scientists have invented other systems of measurement that include units of time, force, [[energy]], and electric charge. The most popular are the meter-kilogram-second and centimeter-gram-second systems.

In addition to the International System (or in French, ''Système International'', or SI for short), scientists have invented other systems of measurement that include units of time, force, [[energy]], and electric charge. The most popular are the meter-kilogram-second and centimeter-gram-second systems.

Various governing authorities have established conversion ratios to assist people in converting between the metric system and other, more traditional units of measurement. The definitions of US Customary units in the United States is an example of this.

Various governing authorities have established conversion ratios to assist people in converting between the metric system and other, more traditional units of measurement. The definitions of US Customary units in the United States is an example of this.