API Gravity

Expressing the gravity or density of liquid petroleum products

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API gravity express the gravity or density of liquid petroleum products 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
Degree API	Specific Gravity	(lb/US gal)	(kg/m³)
8	1.014	8.448	1012
9	1.007	8.388	1005
10	1.000	8.328	998
15	0.966	8.044	964
20	0.934	7.778	932
25	0.904	7.529	902
30	0.876	7.296	874
35	0.850	7.076	848
40	0.825	6.870	823
45	0.802	6.675	800
50	0.780	6.490	778
55	0.759	6.316	757
58	0.747	6.216	745

The formula for API Gravity can be expressed as:

Degrees API Gravity = (141.5 / Specific Gravity at 60^oF) - 131.5 (1)

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Related Topics

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Related Documents

Liquids and Fluids - Specific Gravity - SG Specific gravities for some common fluids and liquids as acetone, alcohol, turpentine, oil and more
Fluids - Kinematic Viscosities Kinematic viscosities of some common fluids - motor oil, diesel fuel, peanut oil and many more
Liquids - Densities Densities of some common liquids - acetone, beer, oil, water and more
API - American Petroleum Institute The American Petroleum Institute - API

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