Answer:
Density
Explanation:
Density is the measure of the amount of matter present in a space of unit volume. It compares the quantity of matter an object occupies to its volume.
A body which contains more amount of matter in a certain volume is said to have higher density where as a body which has less matter or mass in certain volume is said to have lower density. Bodies with lower density tends are lighter than bodies having higher densities.
Mathematically, density is

where ρ is density
m is mass or the amount of matter
v is the volume
Thus density is the measurement is the quantity of mass per unit volume