Specific gravity can be calculated from API gravity:
SG = 141.5 / (°API+131.5) (2)
Note! Oil with the least specific gravity has the highest API gravity
Density is a temperature depedent property. API gravity increases with increasing temperature, while specific gravity decreases with increasing temperature. See correlations at Density of crude oil as function of temperature . This means that the volume of a petroleum liquid increases with increasing temperature, and that a density number always must be given with the measurement temperature. The standard measuring temperature is 15°C or 60°F.
See also Standard test methods (ASTM and others) for crude oil properties , and temperature correlations for lubricating oil , fuel oils and jet fuel .
Degree API | Specific Gravity | Weight | |
---|---|---|---|
[lb/US gal] | [kg/m 3 ] | ||
1 | 1.068 | 8.894 | 1067 |
5 | 1.037 | 8.633 | 1035 |
8 | 1.014 | 8.447 | 1013 |
10 | 1.000 | 8.328 | 998.9 |
15 | 0.9659 | 8.044 | 964.8 |
20 | 0.9340 | 7.778 | 933.1 |
25 | 0.9042 | 7.530 | 903.2 |
30 | 0.8762 | 7.297 | 875.3 |
35 | 0.8498 | 7.078 | 848.9 |
40 | 0.8251 | 6.871 | 824.3 |
45 | 0.8017 | 6.677 | 800.8 |
50 | 0.7796 | 6.493 | 778.8 |
55 | 0.7587 | 6.319 | 757.9 |
60 | 0.7389 | 6.154 | 738.1 |
70 | 0.7022 | 5.848 | 701.5 |
80 | 0.6690 | 5.572 | 668.3 |
90 | 0.6388 | 5.320 | 638.1 |
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