Entropy：A concept that is not a physical quantity

PHYSICS ESSAYS ( Volume 25, Issue 2 (June 2012) ) P172~176 URL: http://physicsessays.org/toc/phes/25/2 Entropy: A concept that is not a physical quantity Shufeng-zhang College of Physics, Central South University, 932 Lushan south Road, Changsha 410083, China E-mail: [e-mail] Abstract : This study has demonstrated that entropy is not a physical quantity, that is, the physical quantity called entropy does not exist. If the efficiency of heat engine is defined as η = W/W1, and the reversible cycle is considered to be the Stirling cycle, then, given ∮dQ/T = 0, we can prove ∮dW/T = 0 and ∮d/T = 0. If ∮dQ/T = 0, ∮dW/T = 0 and ∮dE/T = 0 are thought to define new system state variables, such definitions would be absurd. The fundamental error of entropy is that in any reversible process, the polytropic process function Q is not a single-valued function of T, in thermodynamics, the P-V diagram should be P-V-T diagram, and the key step of Σ[(ΔQ)/T)] to ∫dQ/T doesn’t hold. Similarly, ∮dQ/T = 0, ∮dW/T = 0 and ∮dE/T = 0 do not hold, either. Since the absolute entropy of Boltzmann is used to explain Clausius entropy and the unit (J/K) of the former is transformed from the latter, the non-existence of Clausius entropy simultaneously denies Boltzmann entropy.