Theoretical Physics

Download PDF (426.3 KB) PP. 117 - 123 Pub. Date: September 1, 2019

DOI: 10.22606/tp.2019.43001

• Chengshu Jin^*
  School of Food and Pharmaceutical Engineering, Suihua University, Suihua, Heilongjiang 152061, China

In the paper, the relations of heat or work between a reversible process and its realistic process are discussed, which could be applied to the chemical reactions and Rossini and Frandsen experiment and so on. It is proved the ratios of work to temperature and internal energy change to temperature are all the state function in the reversible process, otherwise, the Clausius inequality will be violated. In an isothermal process of reversible Stirling cycle, the internal energy change is equal to zero for the gas. Thus, the new equation calculating the internal energy change has been obtained for the gas, namely that dU=CVdT, it is convenient and easy calculative.

First law, Clausius inequality, chemical reactions, Stirling cycle, thermodynamic function.

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