Definitions for "API Gravity"
Gravity of crude oil or other liquid hydro-carbon, as measured by a system developed by the American Petroleum Institute. API gravity bears an inverse relationship to true specific gravity, but is more familiar than the decimal fractions which result when petroleum is described according to its specific gravity.
A measure of the density of crude oil.... more on: API gravity
An arbitrary scale expressing the gravity or density of liquid petroleum products. The relation between API scale and specific gravity of petroleum oil is expressed by the formula:Degrees API = (141.5 – 131)/Sp.Gr.