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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 | |
| (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 60oF) - 131.5 (1)
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