| 1 | Remember the Joule expansion. | |
| 2 | At that time it wasn't called joules yet. | |
| 3 | That's our Joule - Thompson expansion. | |
| 4 | You see there on the top there that one calorie is 4.2 joules. | |
| 5 | What is the energy unit in SI? The joule. |
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