James Joules The physicist James Joules, after we we call after him the unit of work was the first to demonstrate that heat energy and mechanical energy are really equivalent.
物理学家，我们以他命名功的单位,他是第一个演示出,热能和机械能相等的人。
We have water, and so you'll find that Q then becomes roughly 5,000 kilocalories that's how much heat energy it takes which is two times ten to the seven joules.
我们有水，你会发现，那么Q就变成约5000千卡，那是需要的热量，是2乘以10的7次方焦耳。
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