Editing API gravity (section)

==API gravity formulas==
The formula to calculate API gravity from [[specific gravity]] (SG) is:

:<math>\text{API gravity} = \frac{141.5}{\text{SG}} - 131.5</math>

Conversely, the specific gravity of petroleum liquids can be derived from their API gravity value as

:<math>\text{SG} = \frac{141.5}{\text{API gravity} + 131.5}</math>

Thus, a heavy oil with a specific gravity of 1.0 (i.e., with the same density as pure water at 60&nbsp;°F) has an API gravity of:

:<math>\frac{141.5}{1.0} - 131.5 = 10.0^\circ{\text{API}}</math>