Which of the two gases, air or carbon dioxide, has the lower final temperature as it is expanded isentropically from 800 kpa and 400°c to 100 kpa in a piston-cylinder device. use room temperature specific heats.

Carbon dioxide have higher temperature at the final stage.

Explanation:

Given that

We know that

γ=1.28 for carbon dioxide

γ=1.4 for air

For isentropic expansion

Now for carbon dioxide γ=1.28

Now for air γ=1.4

So carbon dioxide have higher temperature at the final stage.

answer:

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