Question

What is the term use for the ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure?

Answer 1

We know that,

Vapour density $=\frac{\mathrm{weight}\mathrm{of}\mathrm{certain}\mathrm{volumes}\mathrm{of}\mathrm{gas}}{\mathrm{weight}\mathrm{of}\mathrm{an}\mathrm{equal}\mathrm{volume}\mathrm{of}{\mathrm{H}}_2}$

So, we can say that Vapour density is used for the ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure.