The density of a substance is defined as:

With the increase in temperature, the density of a substance, in general,

Vapour density of a substance is dependant of :

The critical temperature of a substance is defined as:

Critical temperature of a substance is defined as :

Critical temperature of a substance is defined as :

The critical temperature of a substance is defined as :

The critical temperature of a substance is defined as

If relative density of a substance is K then the density of that substance is

Relative density of a substance is expressed by comparing the density of that substance with the density of: