那是一个美好的安息日午后，我出去散步……脑中忽然闪过一个念头：蒸汽既是弹性体，它就会涌入真空；如果在汽缸与一个抽空的容器之间建立通道，蒸汽就会涌入其中，并可在不冷却汽缸的情况下凝结。
I had gone to take a walk on a fine Sabbath afternoon... when the idea came into my mind that, as steam was an elastic body, it would rush into a vacuum, and if a communication were made between the cylinder and an exhausted vessel, it would rush into it and might be there condensed without cooling the cylinder.
发明家
詹姆斯·瓦特
詹姆斯·瓦特（1736-1819），苏格兰发明家与机械工程师。他通过分离冷凝器对纽科门型蒸汽机进行改良，飞跃性地提升了热效率，为工业革命提供了动力源。他与博尔顿合作成功实现了蒸汽机的商业化，其名字永久铭刻于功率的国际单位"瓦特"之中。
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