Joule equivalence

例句：

1. 1. The new model car has a much higher fuel efficiency than the old one.
   这款新型汽车的燃油效率比旧款高得多。
2. 2.The scientists used joule equivalence to calculate the power output of the engine.
   科学家们使用焦耳等价来计算发动机的功率输出。
3. 3.In thermodynamics, joule equivalence is a concept that relates the work done by an external force to the change in internal energy.
   在热力学中，焦耳等价是一个概念，它把外部力所做的功与内部能量的变化联系起来。