Mg is the unit of quality, which is called mg in Chinese. Usually, both liquids and drugs can be calculated in milligrams. The unit of mass is called the unit of weight, which has a long history. Jun, Baht, Liang and Jin were used as units of weight in ancient times, and two or Jin are still used today.

Units refer to organs, organizations or departments subordinate to organs and organizations; Refers to the name of the standard quantity for measuring things in mathematics or physics. Generally, there are: meters, kilometers, cattle n, papapa and other units: units in the traditional sense of Buddhism refer to quantitative units such as length, quality and time. And there are special terms such as: moment, moment, snap of fingers, moment, etc. Accurately speaking, a unit is defined as 1, which is a set of a certain number of substances and becomes a unit.

Broadly speaking, unit is a relative concept and an abstract concept, which can form an individual on the coordinate axis of the object coordinate system. The smallest unit of things is zero.