User:Milton Beychok/Sandbox: Difference between revisions
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The '''API gravity''' is an arbitrary scale developed by the [[American Petroleum Institute]] (API) as a measure of the [[density (chemistry)|density]] of [[Petroleum crude oil|petroleum]] liquids relative to the density of [[water]]. The values of API gravity are expressed as degrees API | The '''API gravity''' is an arbitrary scale developed by the [[American Petroleum Institute]] (API) as a measure of the [[density (chemistry)|density]] of [[Petroleum crude oil|petroleum]] liquids relative to the density of [[water]]. The values of API gravity are expressed as degrees API denoted as °API. | ||
==Relationship between API gravity and specific gravity== | ==Relationship between API gravity and specific gravity== |
Revision as of 17:14, 31 January 2010
The API gravity is an arbitrary scale developed by the American Petroleum Institute (API) as a measure of the density of petroleum liquids relative to the density of water. The values of API gravity are expressed as degrees API denoted as °API.
Relationship between API gravity and specific gravity
The relationship between API gravity and specific gravity (SG) of a petroleum liquid is mathematically expressed as:
- and where:
Conversely, the specific gravity may be obtained from the API gravity by this expression: