The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the...

A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating...

centimetre–gram–second system of units (CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and...

In 2019, four of the seven SI base units specified in the International System of Quantities were redefined in terms of natural physical constants, rather...

biologically active substances). International units as used in pharmacology are not part of the International System of Units (SI). Biologics are medications...

The metre, kilogram, second system of units, also known more briefly as MKS units or the MKS system, is a physical system of measurement based on the metre...

imperial system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first...

This system underlies the International System of Units (SI) but does not itself determine the units of measurement used for the quantities. The system is...

United States customary units form a system of measurement units commonly used in the United States and most U.S. territories, since being standardized...

The system was developed because of the difficulties in measuring and expressing astronomical data in International System of Units (SI units). In particular...