Thermal Processes Video Lessons

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Problem: Irreversible versus Reversible ProcessesPart A Which of the following conditions should be met to make a process perfectly reversible?Check all that apply.(1) Any mechanical interactions taking place in the process should be frictionless.(2) Any thermal interactions taking place in the process should occur across infinitesimal temperature or pressure gradients.(3) The system should not be close to equilibrium.Part BBased on the results found in the previous part, which of the following processes are not reversible?Check all that apply.(1)       Melting of ice in an insulated ice-water mixture at 0?C.(2)       Lowering a frictionless piston in a cylinder by placing a bag of sand on top of the piston.(3)       Lifting the piston described in the previous statement by removing one grain of sand at a time.(4)       Freezing water originally at 5?C.

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Part A

A perfectly reversible process is the process where the direction can be reversed by making infinitesimal changes.

For a process to be reversible, two conditions must be satisfied:

1. The process must take place in a very small time.

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Problem Details

Irreversible versus Reversible Processes


Part A 

Which of the following conditions should be met to make a process perfectly reversible?

Check all that apply.


(1) Any mechanical interactions taking place in the process should be frictionless.

(2) Any thermal interactions taking place in the process should occur across infinitesimal temperature or pressure gradients.

(3) The system should not be close to equilibrium.


Part B

Based on the results found in the previous part, which of the following processes are not reversible?

Check all that apply.


(1)       Melting of ice in an insulated ice-water mixture at 0?C.

(2)       Lowering a frictionless piston in a cylinder by placing a bag of sand on top of the piston.

(3)       Lifting the piston described in the previous statement by removing one grain of sand at a time.

(4)       Freezing water originally at 5?C.

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