Boltzmann Equation for Entropy:
5 posts • Page 1 of 1
Gas molecules will never go back to a smaller volume because it would decrease the entropy, or amount of states, of that system. In a smaller volume, there are less possible organizations for the molecules. Objects always want to go to a state of greater entropy, and moving to a smaller volume would decrease that.
Another way to think about it is how gases behave logically. They're not going to ever want to revert to a state where they have less space/freedom to move around. And a generally good rule of thumb is that gases are always going to want to go to a state of increased entropy, as explained in the previous reply.
A real life example of this that might help you understand this would be spraying perfume in the corner of a room. It is "spontaneous" for the scent molecules to disperse throughout the room rather than to stay only in the corner. It is a lot like the diffusion of water across a membrane in biology.
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