API gravity

API gravity
  American Petroleum Institute measure of specific gravity of crude oil or condensate in degrees. An arbitrary scale expressing the gravity or density of liquid petroleum products. The measuring scale is calibrated in terms of degrees API; it is calculated as follows:
  Degrees API = (141.5 / sp.gr.60 deg.F/60 deg.F) - 131.5
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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