
A transformation whose only final result is to convert heat, extracted from a source at constant temperature, into work, is impossible.
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Wed 7 Nov 2007, 16:04,
archived)

'The increase in the internal energy of a system is equal to the amount of energy added by heating the system, minus the amount lost as a result of the work done by the system on its surroundings.'
( ,
Wed 7 Nov 2007, 16:07,
archived)