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Theoretical Physics
TP > Volume 4, Number 3, September 2019

Equation Calculating Internal Energy Change Derived from the Clausius Inequality

Download PDF  (426.3 KB)PP. 117-123,  Pub. Date:August 21, 2019
DOI: 10.22606/tp.2019.43001

Author(s)
Chengshu Jin
Affiliation(s)
School of Food and Pharmaceutical Engineering, Suihua University, Suihua, Heilongjiang 152061, China
Abstract
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.
Keywords
First law, Clausius inequality, chemical reactions, Stirling cycle, thermodynamic function.
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