What is the derivation of formula used for determining to API gravity of crude oil ?

formula for API gravity

API Gravity = 141.5 – S.G/ 131.5

From where values 141.5 & 131.5 are taken

141.5 comes from hydrometers that were distributed with a modulus of 141.5 instead of the Baume 140

131.5 is the cut off for light crude

anything less is medium crude and less than 122.3 is heavy crude

hope this helps

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