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While it is impossible to take heat q from a reservoir

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Unformatted text preview: n the gas. The net effect of expansion and compression (assuming both processes performed in a reversible fashion) would be that that gas has done zero work. Consequence 3. Entropy of the world increases (if we assume he world to be an isolated system) 2nd law and heat engines: The so called perpetual motion machine of the 1st kind produces work without any energy source. The conservation energy law or, equivalently, the 1st law of thermodynamics asserts the impossibility of such a machine. The perpetual motion machine of the 2nd kind converts heat into work with a 100% efficiency. The 2nd law asserts that such a machine is impossible....
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