API gravity express the gravity or density of liquid petroleum products
API gravity express the gravity or density of liquid petroleum products. API is devised jointly by the American Petroleum Institute and the NIST - National Institute of Standards and Technology. The measuring scale is calibrated in terms of degrees API.
- Oil with the least specific gravity has the highest API gravity
|Degree API||Specific Gravity||Weight|
API Gravity can be calculated as:
API = (141.5 / SG) - 131.5 (1)
API = Degrees API Gravity
SG = Specific Gravity (at 60oF)