Degree API (°API)
Degree API (°API) :
A unit invented by the American Petroleum Institute (API) to measure the specific gravity, or one might say the "lightness," of petroleum. Lighter oils are more valuable, so the API scale gives them higher readings than heavier oils. If S is the specific gravity of the petroleum at temperature 60 oF (15.56 oC), the API degree rating is equal to (141.5/S) - 131.5 degrees
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