Revise GCSE Physics

Question: What happens when heat flows between two objects?

Energy is never created or destroyed (or lost down the back of the sofa).

So if energy is moving from one object to another, then the hotter object will be losing energy and the colder object will be gaining energy, in equal amounts.

NB. Heat transfers always occur in pairs. If you cannot see the second object, then it is probably the surroundings.