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对于永动机,科学界早有定论．由于它既要不消耗能量,又要不断地对外做功,违反了能量守恒定律,所以是不可能存在的．但总有一些人在孜孜不倦地研制永动机, 当然到目前为止无一例成功．不过从另一个角度也可以认为,这些人的热情与实践也推动了热力学体系和机械制造技术的进步．本文中的例题均取材于历史上风靡一时的永动机,了解它们不能实现的原因可以加深同学们对能量守恒定律的理解．
For perpetual motion machine, the scientific community has long been conclusive. Because it not only consumes energy, but also continue to work on the outside, in violation of the law of conservation of energy, so it is impossible to exist. But there are always some people who tirelessly develop perpetual motion machines, of course, so far without any success. However, from another perspective, we can also think that the enthusiasm and practice of these people have also promoted the progress of thermodynamic systems and mechanical manufacturing technologies. The examples in this article are based on the all-time perpetual motion machine in history, understand why they can not be achieved to deepen the students’ understanding of the law of conservation of energy.