A vacuum engine refers to any kind of engine which derives its force from air pressure against one side of the piston, while also having a partial vacuum on the other side of it. This pressure differential can be the result of heat transfer, or mechanically produced by an external source.
A vacuum engine refers to any kind of engine which derives its force from air pressure against one side of the piston, while also having a partial vacuum on the other side of it. This pressure differential can be the result of heat transfer, or mechanically produced by an external source.
Source: Wikipedia "Vacuum engine" · CC BY-SA 4.0
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