Question

why a gas has two principle specific heat capacities?? what is the significance of Cp-Cv and Cp/Cv where symbols have usual meaning.

Answer 1

Let's try to understand this concept by a very practical example you should be having two names one of your school and other of your home because one can't define you just by your single name Similarly in gas There are two terms that we use Cp => which means specific heat capacity of gas at constant pressure I.e to say when we supply heat to the gas at constant pressure it is defined as Cp and Cv= which means specific heat capacity of a gas at constant volume I.e to say when we supply heat to the gas at constant volume Cv is defined.

Now Cv=fR/2 where f stands for degree of freedom of the gas
Cp=Cv+R

And Cp/Cv=Y and it's value is 1.66 for monotonic gas , 1.53 for diatomic gas
1.33 for triatomic gas

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