Specific Gravity of Gas

on . Posted in Classical Mechanics

Specific gravity of gas, abbreviated as \(SG_g\), a dimensionless number, is the ratio of the density of the gas to the density of air at a standard pressure and temperature.


Specific Gravity of Gas formula

\(\large{ SG_g = \frac{ \rho_g }{ \rho_a }  }\)     (Specific Gravity of Gas)

\(\large{ \rho_g =  SG_g \; \rho_a  }\)

\(\large{ \rho_a = \frac{ \rho_g }{ SG_g }  }\)

Symbol English Metric
\(\large{ SG_g }\) = specific gravity of gas (air = 1.0) \(\large{dimensionless}\)  
\(\large{ \rho_a }\) = density of air \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)
\(\large{ \rho_g }\) = density of gas \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)


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Tags: Gravity Gas