API gravity

noun

A specific gravity scale measuring the relative density of various petroleum liquids, expressed in degrees.

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Meanings

nounAPI gravity (countable and uncountable, plural API gravities)

plural API gravities

  1. countableuncountableoil industryA specific gravity scale measuring the relative density of various petroleum liquids, expressed in degrees.

Origin

From API (“American Petroleum Institute”).

Full word history & related roots →

Translations

Portuguese grau API
  • grau APIdensity of petroleum liquid relative to water
Cite this entry
APA

API gravity. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/API%20gravity

MLA

“API gravity.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/API%20gravity. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “API gravity,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/API%20gravity.

Source: API gravity on Wiktionary, CC BY-SA 4.0.