what are the basic units of measurement in the metric system
Metric system In its modern form, it consists of a set of base units including metre for length, kilogram for mass, second for time and ampere for electrical current, and a few others, which together with their derived units, can measure any physical quantity. Metric system may also refer to other systems of related base and derived units defined before the middle of the 20th century, some of which are still in limited use today.
Metrication in the United States Although customary units are used more often than metric units in the U.S., the SI system is used extensively in some fields such as science, medicine, the military, automobile production and repair, and international affairs. Post 1994 federal law also mandates most packaged consumer goods be labeled in both customary and metric units.[4] Still, most Americans are unable to make metric conversions,[5] but smartphone apps can help (e.g. on iOS[6] and Android[7]).