May 2011
Beginner
492 pages
14h 16m
English
Content preview from Heat and Thermodynamics
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5.7 Reduced Equation of State and Law of Corresponding States
Van der Waals’ equation of state contains a,b and R, the first two of which are the characteristic constants of a gas and the third one is universal gas constant. The presence of a and b makes the nature of the isothermals different for different gases hence, the equation of state is not universal. The attempt of building up an equation of state which is of universal use succeeded in developing reduced equation of state. If the three variables are measured in units of their corresponding critical values, then the resulting equation is called the reduced equation of state. Let us define three reduced quantities pr, vr, Tr as
Then from Van der Waals’ equation of state,
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