### 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?

#### 2 Answers

Dan01
6 years, 2 months ago

Specific gravity of gas is ratio of molecular weight of gas to that of air.

Normandy
6 years, 1 month 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.*

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