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The American Petroleum Institute gravity, or API gravity, ... Temperature correction: If the measurement is not performed at the standard temperature, ...
Since API gravity is an inverse measure of a liquid's density relative to that of water, it can be calculated by first dividing the liquid's density by the density of water at a base temperature (usually 60 °F) to compute Specific Gravity (SG), then converting the Specific Gravity to Degrees API as follows: = =
Consider, at near room temperature: +100 °Bé (specific gravity, 3.325) would be among the densest fluids known (except some liquid metals), such as diiodomethane. Near 0 °Bé would be approximately the density of water. −100 °Bé (specific gravity, 0.615) would be among the lightest fluids known, such as liquid butane.
Specific gravity for solids and liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F). The term "relative density" (abbreviated r.d. or RD ) is preferred in SI , whereas the term "specific gravity" is gradually being abandoned.
Stack Tank Oil (STO) density (or API) may also be used by regulatory bodies to classify oil and oil products. Other properties such as Molecular Weight , saturated aromatic resin and asphaltene (SARA), refractive index , wax appearance temperature, asphaltene precipitation, and acid number , are also specified at Stock Tank conditions. [ 1 ]
Density correction is also performed on liquids under measurement. For instance, the sticker on gasoline pumps that states that the volume is corrected to 15 °C (59 °F, or 60 °F in the U.S.) means that the measured volume has been compensated for thermal expansion. One would otherwise get a larger mass of gasoline in a tank filled in cold ...
Liu says that she and her research team have submitted a correction to the journal, which should be published soon. But this may not change the conclusion. Despite the mathematical error, Liu says ...
API gravity Sulphur content (as % of mass) Operating company Location of field Port of sale Abu Bukhoosh 31.6° 2.0% Total Abu Al Bukhoosh Dubai: Abu Al-Bukhoosh Agbami 47.5° 0.044% Chevron: Nigeria: offshore Undisclosed Undisclosed Undisclosed Genel Energy/CPC Taiwan Somaliland: Central Somaliland oil fields Aktobe 41.6° 0.73% Kazakhstan ...