Go to ...


Physics Fundamentals BLOG for K12

RSS Feed

How does Density differ from Relative Density?

Difference between Density and Relative Density


Density is the mass per unit volume. So if we divide the mass of a substance with its volume then we get the density of that substance. Here we get another definition of mass. Mass=volume X density. Unit of density in SI is Kg/meter3. So if we say density of ice is 916 kg/meter3 in SI means if we take a slab of ice of unit volume (length=1 meter, breadth = 1 meter and height = 1 meter), and measure its mass then its mass will be 916 kg.Similarly density of water is 1000 kg/m3 means water of 1 cubic meter volume have a mass of 1000 kg.

Relative Density

Relative density of a substance is the ratio of its own density and the density of water. It’s a comparative parameter calculated with respect to water’s density. It’s a ratio of two densities and a number only without any unit.

Relative density of water is certainly 1. [Relative density of water = density of water/density of water = 1]

And relative density of ice = density of ice / density of water = 916/1000 = .916

from PhysicsTeacher.in, an online free physics coaching blog - physics for school students

One Response “How does Density differ from Relative Density?”