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Specific Gravity is the ratio of the density of a liquid to the density of water, What is the Specific Gravity of a Gas?

Specific Gravity (Relative Density) SG also called relative density that is ratio of the density of a substance to that of a standard substance
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    Specific Gravity (Relative Density) SG also called relative density that is ratio of the density of a substance to that of a standard substance. At a specified temperature and can be expressed as

    SG = ρsubstance / ρH2O 

    where
    SG = Specific Gravity of the substance
    ρsubstance = density of the fluid or substance [kg/m3]
    ρH2O = density of water – normally at temperature 4 oC [kg/m3]

    The specific gravity of a gas, γ, is the ratio of the density of the gas at standard pressure and temperature to the density of air at the same standard pressure and temperature. The standard temperature is usually 60°F, and the standard pressure is usually 14.696 psia. However, slightly different standards are sometimes used in different locations and in different units. The ideal gas laws can be used to show that the specific gravity (ratio of densities) is also equal to the ratio of the molecular weights. By convention, specific gravities of all gases at all pressures are usually set equal to the ratio of the molecular weight of the gas to that of air (28.967). Although specific gravity is still frequently used, this traditional term is not used under the SI system; it has been replaced by “relative density.”

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