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Crude Oil API Gravity

The define API (American Petroleum Institute) gravity, one should first define the specific gravity of a liquid. Liquid specific gravity, γo , is defined as the ratio of the density of the liquid to the density of water, both taken at the same temperature and pressure.

The most widely used indicator of a crude oils worth to the producer is API gravity. This value is actually a measure of an oil density, and is related to specific gravity by the following equation:

API gravity of 10 is equivalent to the specific gravity of 1. Normally the price, which a producer receives for his/her oil, depends on its gravity, the less dense (higher API) being the most valuable.

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