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**Mass (kg, gm, mg, microgram) **

**Mass** is the amount of substance or matter something is made of.

The mass of any substance is determined by weight or the gravitational forces acting it. (more)

**gm** is an abbreviation for **gram** and is a unit of weight.

An even shorter abbreviation used is **g**.

**k** placed before other abbreviations is an abbreviation for **kilo** which means one thousand (1000).

Therefore 1 **kilogram** = 1000 **gm** (**kg** is an SI unit for mass) (more)

**m** placed before other abbreviations is an abbreviation for **milli**-, which means one thousandth (1/1000).

Therefore 1 **milligram** (**mg**) = one thousands (1/1000) of a **gram**

or 1 **gm** = 1000 **milligram** (**mg**)

**microgram** placed before other abbreviations is an abbreviation for **micro**-, which means one millionth (1/1,000,000).
Therefore 1 **microgram** (**mg**) = one millionth (1/1,000,000) of a **gram** or 1 **gm** = 1,000,000 **micrograms**