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Clausius’ Statement of the Second Law

6.4.1 Statement

“It is impossible to construct a device which, operating in a cycle, will transfer heat from lower temperature body to a higher temperature body at its sole effect.

 

6.4.2 Explanation

Heat cannot flow of itself from a lower temperature body to a body at a higher temperature. Some work is to be done.

Fig. 6.7 shows that W is to be done on the system R to transfer Q1 amount of heat to a body at T1.

Here Q1 – Q2 = W.