How is density different from mass and volume?

Density is a
quantity that is related to both mass and volume. It is usually denoted by the Greek letter
"rho" and is calculated as 

`rho = m/V` ,

where
m is the mass and V is the volume. That is, density is mass per unit volume. 

Mass is a quantity that determines how heavy an object is, and it is measured, in
metric system, in kilograms. Volume determines how much room an object takes up, and it is
measured in cubic meters. Density is the ratio of these two quantities, which determines how the
mass is spread out over the volume. Density is measured in kilograms per cubic
meter: `(kg)/m^3`

So, for two objects with the same volume, the object with
greater mass will have higher density. If two objects have the same mass, the object with larger
volume will have lower density.

href="http://hyperphysics.phy-astr.gsu.edu/hbase/dens.html">http://hyperphysics.phy-astr.gsu.edu/hbase/dens.html