@wikipedia
Synonym: Relative Density = Specific gravity
Dimensionless ratio of the actual fluid density to the fluid density of a reference substance , both taken at reference conditions (equal or close to STP, which should be specified individually):
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SG= \frac{\rho}{\rho_{\rm ref}} |
The selection of reference substance and the corresponding value of
depends on the context.
For fluids which are liquid at STP this is usually a distilled water and for fluids which are gaseous at STP this is usually a dry air:
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| body | \rho_{\rm ref} = \rho_{\rm H_2O} |
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| body | \rho_{\rm ref} = \rho_{\rm air} |
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| body | --uriencoded--\displaystyle \gamma_L= \frac%7B\rho_L%7D%7B\rho_%7BH_2O%7D%7D |
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| body | --uriencoded--\displaystyle \gamma_g= \frac%7B\rho_g%7D%7B\rho_%7B\rm air%7D%7D |
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See also
Natural Science / Physics / Fluid density
[ API gravity ][ Oil specific gravity (γo) ][ Gas specific gravity (γg) ][ Liquid specific gravity (γL) ]
