Procedure Title: API
Theory of Operation:
• API is a measure of how heavy or light petroleum liquid is compared to water.
• It is an inverse measure of a petroleum liquid’s density relative to that of water (Specific Gravity).
• It is used to compare densities of petroleum liquids.
Place the pycnometer on the balance, then tare.
Fill the pycnometer with the oil.
Weigh the oil.
The API gravity is calculated according to the following formula:
API (degree) = ————————————————– – 131.5
Specific Gravity @ 60° F