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In effusion, we take an assumption that there is a vacuum on the other side of the separating membrane and no resistance occurs to the flow of gas through the fine hole. Then how is free expansion different? Also, is there any difference w.r.t temperature change accompanying free expansion and effusion?

In effusion, we take an assumption that there is a vacuum on the other side of the separating membrane and no resistance occurs to the flow of gas through the fine hole.
Then how is free expansion different?
Also, is there any difference w.r.t temperature change accompanying free expansion and effusion?

Grade:12

1 Answers

Aman Bansal
592 Points
12 years ago

Dear Siddhant,

Free expansion and effusion are related. Effusion occurs even during free expansion.
But when we say free expansion, we see the thermodynamin aspect of the process while in effusion, rates etc are compared.
Free expansion will occur when gas is left in a insulated evacuated chamber and for effusion, some pressure difference is required.

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