1 British thermal unit (IT) is equal to 2.4199949965126E+20 Hartree
| British thermal units (IT) (BTU) | Hartree (Ha) |
|---|---|
| 15 | 3.6299924947689E+21 |
| 20 | 4.8399899930251E+21 |
| 25 | 6.0499874912814E+21 |
| 30 | 7.2599849895377E+21 |
| 35 | 8.469982487794E+21 |
| 40 | 9.6799799860503E+21 |
| 45 | 1.0889977484307E+22 |
| 50 | 1.2099974982563E+22 |
| 55 | 1.3309972480819E+22 |
| 60 | 1.4519969979075E+22 |
| 65 | 1.5729967477332E+22 |
| 70 | 1.6939964975588E+22 |
| 75 | 1.8149962473844E+22 |
| 80 | 1.9359959972101E+22 |
| 85 | 2.0569957470357E+22 |
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