\begin{definition}[Definition:Density (Physics)]
'''Density''' is a physical quantity.
The '''density''' of a body is its mass per unit volume.
For a homogeneous body it is found by finding its total mass and dividing it by its total volume:
:$\rho = \dfrac m V$
where:
:$m$ is the body's mass
:$V$ is the body's volume
However, if the substance of the body varies throughout, then its '''density''' may be a function of position within the body.
\end{definition}