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Dimensionless ratio of the gas density 

LaTeX Math Inline
body\rho
to the air density air density
LaTeX Math Inline
body--uriencoded--\rho_%7Bair%7D
, both taken at reference conditions (equal or close to normally at STP, which otherwise should be specified individuallyin the context):

LaTeX Math Block
anchor1
alignmentleft
\gamma_g = \frac{\rho_g}{\rho_{\rm air}}

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Natural Science / Physics / Fluid density / Specific gravity

API gravity ][ Oil specific gravity (γo) ]