The density ρ of a fluid is its mass per unit volume. The densities of air and water at standard conditions of 20°C and 101.325 kPa (sea level atmospheric pressure) are
ρwater = 998 kg/m3
ρair = 1.20 kg/m3

Density is a compound measure that tells us about the mass of an object in relation to its volume.

For example, if an object has a mass of 100 kg and a volume of 2.5 cubic meters then the density would be

Density = mass ÷ volume =100÷2.5=40 kg/m3.

Density Mass Volume Triangle

Units of Mass:

1 g=1000 mg
1 kg=1000 g

Units of Volume:

1 m3=1000000 cm3
1 litre=1000 ml
1 ml=1 cm3
1 litre=1000 cm3

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