For Api Gravity we have terms and definitions in 8 topics. The topics are Car Care, Energy, Gasoline, Global Warming, Import Cars, Oil, Oil Acronyms and Oil and Gasoline.

A gravity scale established by the American Petroleum Institute and in general use in the petroleum industry, the unit being called "the A.P.I. degree." This unit is defined in terms of specific gravity as follows:
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The universally accepted scale adopted by the American Petroleum Institute (API) for expressing the density of liquid petroleum products. The higher the API gravity, the lighter the oil.
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The American Petroleum Institute scale used to express the specific gravity of oils.
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A scale expressing the density of petroleum products as established by the American Petroleum Institute.
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The scale for the density (gravity) of a liquid petroleum product, expressed in API degrees. The lighter the product the higher the number.
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A scale developed by the American Petroleum Institute for measuring the density or gravity of oil; the higher the number, the lighter the oil.

An arbitrary scale expressing the gravity or density of liquid petroleum products devised jointly by the American Petroleum Institute and the National Bureau of Standards. The measuring scale is calibrated in terms of degrees API. Oil with the least specific gravity has the highest API gravity. The formula for determining API Gravity is as follows:
Degrees API Gravity= (141.5/Specific Gravity at 60 Deg. F) 131.5
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The industry standard method of expressing specific gravity of crude oils. Higher API gravities mean lower specific gravity and lighter oils.
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