4 March 2017

What is density

Density is a degree of compactness of a substance.

Density is defined as the ratio of the mass of a fluid to its volume. thus mass per unit volume of a fluid is called density.

It denoted as ρ.

ρ = Mass of fluid / Volume of fluid

The unit of density :

SI Unit : kg / cubic meter = kg/m3

The density of liquids may be considered as constant while that of gases changes with the variation of pressure and temperature.

The density of water is 1 gm/cm3 or 1000 kg/m3.

Density and viscosity both of them have a certain similarity. 
Don't get confused with each other terms. You can go to the difference between viscosity and density and clear your confusion.