The American Petroleum Institute gravity, or API gravity, is a measure of how heavy or light a petroleum liquid is compared to water: if its API gravity is greater than 10, it is lighter and floats …

Formulas and examples of calculation of average molecular weight of hydrocarbon mixtures from gravity and average boiling point, achieved from distillation data.

API gravity is defined as the heaviness or lightness property of the liquid with respect to water. This parameter is specifically derived for petroleum products.

Jun 12, 2025 · API gravity, an acronym for American Petroleum Institute gravity, is a specific gravity scale developed by the API for characterizing the relative density of petroleum liquids.

Table Definitions, Sources, and Explanatory Notes

Sep 3, 2025 · In the petroleum industry, API gravity is one of the main measurements used to classify crude oil and refined products. Developed by the American Petroleum Institute (API), …

Crude oil is classified as light, medium, or heavy according to its measured API gravity. Light crude oil has an API gravity higher than 31.1° (i.e., less than 870 kg/m 3 )