If energy can’t be created or destroyed, what happens to heat when it eventually cools down?

Question

Energy cannot be created or destroyed, then where does it go when cooling or heating over time?

In: Physics

Answer 1

Heat just spreads out to other places, leaving the “hot” thing to be “cool”. Most of the time it’s taken up by surrounding liquid or air that is cooler and can therefore “hold” some of the heat, while the “hot” thing is trying to cool down or shed some of that heat.