We define heat engine efficiency η as: η= W/W1, that is, replacing Q1 in the original definition η=W/Q1 with W1, W still is the net work of the heat engine applied to the outside in one cycle, W1 is the work the heat engine applied to the outside in the cycle, then, we use Stirling cycle as the element reversible cycle, if ∮dQ/T =0 is tenable, we can prove ∮dW/T =0 and ∮dE/T =0.

If the formula ∮dQ/T=0,∮dW/T=0 and ∮dE/T=0 can really define new system state variables, it should come to the absurd result of such a definition.

In fact, during the process of obtaining entropy, ∑[(ΔQ)/T)] becoming ∫dQ/T is untenable, therefore, the formula ∮dQ/T=0, ∮dW/T=0 and ∮dE/T=0 are all untenable.

Entropy：A concept that is not Physical Quantity

By shufeng-zhang Email: uhsgnahz@126.com

College of Physics,Central-South University,China

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