Measure of the fluid density of a substance with specific gravity at reference (usually STP) conditions:
\gamma_{API} \, [{\rm ^\circ API}] = \frac{141.5}{\rm SG} - 131.5 |
This is a popular density unit for crude oil and gas condensate.
Natural Science / Physics / Fluid density / Specific gravity
[ Oil specific gravity (γo) ][ Gas specific gravity (γg) ]