瓦特把机器拉回格拉斯哥大学,这个机器不算太大。气缸的直径两英寸,换算成公制大约5公分,活塞行程大约6英寸,换成公制大约是15公分。瓦特就开始鼓捣这玩意儿。说白了不是一个实用的蒸汽机,是个教学模型。瓦特发现这个机器的效率低的可怜,烧一锅水运行不了多久就不动了。瓦特开始思考,到底蒸汽的力量都消耗到哪里去了。他自己搞了个水壶做实验,他就是想了解一下,到底蒸汽的温度和体积到底能有什么样的关系。他发现,把水烧成蒸汽,体积扩大了6倍。这都是在标准大气压下测试的。那时候热力学还在萌芽状态,很多东西都没有现成的公式和单位,瓦特全靠自己鼓捣。他假定,1克水从0度加热到开锅,需要的热量为100单位。他发现1克100度的水变成100度的蒸汽,需要534单位的热量。现代测量的数值是537,瓦特的测试有误差,但是大差不差了。瓦特最奇怪的是温度完全没变化,蒸汽是100度,水也是100度。为什么那么多的热量并没有使温度提高呢?瓦特理解不了……
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