API gravity scale
British
noun
-
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
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