What force causes entropy to increase?
I realize that the second law of thermodynamics requires the entropy of a system to increase over time. For example, gas stored in a canister, if opened inside a vacuum chamber, will expand to fill the chamber.
But I’m not clear on what force, exactly, is acting upon the molecules of gas that causes them to fly out of the opened canister and fill the chamber.
Just looking for a concise explanation as to what is going on at the fundamental level, since obviously, the second law of thermodynamics is not a force and therefore does not cause anything to happen.