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A degree API of an oil relates to

  • A.its sulphur content as delivered
  • B.its boiling range in the still
  • C.its specific gravity, inversely
  • D.its viscosity at some stated temperature

Answer: C

A higher API number means a lighter oil, so the scale runs opposite to specific gravity. It is one of several industry scales, such as Baume and Twaddell, defined against water in the same way. Each was devised for a particular trade.

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