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能量不灭的定律,简单地说,是这样的:“能量从不能创生,也从不能毁灭;在任何情形下,若是外面的能未曾加入,原有的能量未曾逸去的时候,总的能量,不管采取的何种的形状,在数量上是永不改变的”。举一个例,煤与氧化合而发生热能,这个热能使水变成蒸汽,蒸汽的“分子能”推动一架汽轮机,汽轮机的机械能转动一架发电机,发电机所生出来的电能则可以转换为光、为声、为热、为机械能,或为化学能。如果那一部份因摩擦与发散而失去的能量,可以量度出来,加到由发电机输动的各种设备所产生的所有能量里面,你所得到的总和必然等于原来煤燃烧的时候所释放的全部热量。这里有几个例子表明了能量是如何转换和保存的。
The law of immortality, simply put, is this: “Energy cannot never be created, nor can it be destroyed; in any case, if the outside energy has not been added, the original energy has not escaped, and the total Energy, no matter what shape it takes, will never change in quantity." As an example, coal and oxygen are combined to generate heat energy. This heat energy turns water into steam. The molecular energy of steam drives a steam turbine. The mechanical energy of a steam turbine turns a generator. The energy generated by a generator can be converted. Light, sound, heat, mechanical energy, or chemical energy. If that part of the energy lost due to friction and divergence can be measured and added to all the energy generated by the various devices that are transferred by the generator, the total sum you get must be equal to the release of the original coal when it burns. The entire heat. Here are a few examples of how energy is converted and saved.