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 on water; if less than 10, it is heavier and sinks. API gravity is thus an inverse measure of the relative density of a petroleum liquid and the density of water, but it is used to compare the relative densities of petroleum liquids. For example, if one petroleum liquid floats on another and is therefore less dense, it has a greater API gravity. Although mathematically, API gravity has no units (see the formula below), it is nevertheless referred to as being in "degrees". API gravity is gradated in degrees on a hydrometer instrument. The API scale was designed so that most values would fall between 10 and 70 API gravity degrees.
Read more about API Gravity: History of Development, API Gravity Formulas, Using API Gravity To Calculate Barrels of Crude Oil Per Metric Ton, Measurement of API Gravity From Its Density, Direct Measurement of API Gravity (Hydrometer Method), Classifications or Grades
Other articles related to "api, api gravity":
... Standards bodies such as the American Petroleum Institute (API) have adopted the convention that if oil is measured in oil barrels, it will be at 14.696 psi and 60 °F, whereas if it is ... on the oil's composition, indicated by its density or API gravity ... In warming from 15 °C to 60 °F, a heavy oil with API gravity of 20 (932 kg/m3) will increase in volume by 0.039% ...
... Generally speaking, oil with an API gravity between 40 and 45 commands the highest prices ... medium or heavy, according to its measured API gravity ... Light crude oil is defined as having an API gravity higher than 31.1 °API (less than 870 kg/m3) Medium oil is defined as having an API gravity ...
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“Grown beyond nature now, soft food for worms,
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—Derek Mahon (b. 1941)