An arbitrary scale expressing the gravity or density of liquid
petroleum products. The measuring scale is calibrated in terms of
degrees API; it is calculated as follows:
Degrees API = (141.5 / (sp. gr. 60ºF / 60ºF)) - 131.5
The
higher the API gravity, the lighter the compound. Light crudes
generally exceed 38 degrees API and heavy crudes are commonly
labeled as all crudes with an API gravity of 22 degrees or below.
Intermediate crudes fall in the range of 22 degrees to 38 degrees
API gravity.
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