However if you want to reuse the gas it will have to

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Unformatted text preview: vert it all to work (e.g. left a weight), then let the weight fall on a hotter object heating it up. The net effect of all this would be transfer of heat from a hotter object to a colder object, which would violate Consequence 1. Notice that the requirement of being cyclic is essential. You can extract heat from a thermal reservoir to produce work by having isothermal expansion of a gas that is in contact with the reservoir. However if you want to reuse the gas it will have to return to its original state. If you compress it again at the same temperature, you will have to do work o...
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