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A certain ideal gas undergoes an isovolumetric process that decreases the pressure. Does heat flow into...

A certain ideal gas undergoes an isovolumetric process that decreases the pressure. Does heat flow into or out of the gas during this process? How do you know?

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Answer #1

According to First law of thermodynamics,  

For a isovolumetric process, the volume remains constant, , So,  

Now Internal Energy is a function of Temperature, .... Eqn (1)

The gas follows a isovolumetric process, that is Gay-Lussac law,

Since pressure is decreased, which means,   

So Eqn (1), is -ve,

But , which means Q is also negative, Which means heat is flowing out

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