Density

Density is the amount of mass contained in a given volume or mass per unit volume. An object
with large volume but small mass will have a small density. On the other hand, an object that
has small volume but a large mass will have a large density. Cotton and sponge are objects of
small density whereas iron and lead have large density. The symbol for density is the Greek
letter rho and the formula for it is:
ρ = m/V