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# What is Specific Gravity of Gas?

asked Mar 25, 2014 in Process
Specific gravity is the ratio of the density of a liquid to the density of water, then what is Specific Gravity of Gas?

+1 vote
answered Mar 29, 2014 by (1,560 points) | selected Apr 17, 2014 by Normandy

Specific gravity of gas is ratio of molecular weight of gas to that of air.
answered Apr 18, 2014 by (21,040 points)

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.