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API gravity scale

noun

  1. the American Petroleum Institute gravity scale: a universally accepted scale of the relative density of fluids that is used in fuel technology and is measured in degrees API. One degree API is equal to (141.5/ d )–131.5, where d = relative density at 288.7K See also Baumé scale
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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