### What is Specific Gravity of Gas?

Specific gravity is the ratio of the density of a liquid to the density of water, then what is Specific Gravity of Gas?

1
7 years, 5 months ago
Specific gravity of gas is ratio of molecular weight of gas to that of air.

0
7 years, 5 months ago

Specific Gravity of a gas can be calculated as

$$SG = {\rho \over \rho air}$$

where
SG = specific gravity of Gas
ρ = density of gas (kg/m3)
ρair = density of air (kg/m3)
* In a normal condition, air is defined at 20oC and 1 atm and density of air is 1.205 kg/m3 is used.