# Definition:Mass

## Definition

The mass of a body is a measure of how much matter it contains.

Mass is equivalent to inertia.

Mass also determines the degree to which a body creates or is affected by a gravitational field.

It is a scalar quantity.

### Symbol

The usual symbol used to denote the mass of a body is $m$.

### Dimension

Mass is one of the fundamental dimensions of physics.

In dimensional analysis it is assigned the symbol $\mathsf M$.

### Units

The units of measurement of mass are as follows:

Thus:

$1 \ \mathrm {kg} = 10^3 \ \mathrm g$
$1 \ \mathrm {lb} = 0.453 \, 592 \, 37 \ \mathrm{kg}$