The second law of thermodynamics states that entropy always increases, which means that if there was a point where there was heat inside a box, the heat would dissipate throughout the box. If we wanted to return all that heat to the original point, we would have to add energy to move the heat to its original point. Wouldn’t this mean that energy is lost when the heat dissipates?
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It’s being lost as *usable* energy. The total amount of kinetic energy is still there, but it can no longer be used to do things, it’s just there, making the room a bit hotter than it had been.
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