Unit of measurement for mass in the International System of Units (SI).

### Notation

The symbol for gram is “g” which signifies “gram.”

- In one gram, there are 1000 milligrams and we write: 1 g = 1000 mg.
- In one kilogram, there are 1000 grams and we write: 1 kg = 1000 g.
- One gram corresponds to the mass of one cubic centimetre of pure water at a temperature of 4°C.

### Examples

- The mass of a pill is about 45 mg.
- The mass of an average apple is about 250 g.
- On average, the mass of an adult man is 75 kg.
- One litre of air weighs 1.3 g.
- One standard sheet of paper weighs about 5.6 g.

### Historical note

The term “gram” comes from the ancient Greek word γράμμα, and it is equal to one twenty-fourth of a Roman ounce. This unit of mass was created in 1793 and in 1795, the kilogram appeared, which is equal to 1000 grams.