Revise GCSE Physics

Question: When does heat flow stop?

Heat will stop flowing only when there is no longer a temperature difference between the two objects.

This will happen eventually because the temperature of the hot object will usually fall as it loses energy and the temperature of the colder object will usually rise as it gains energy.

The only exception is if one of the two objects is changing state at the same time; in which case that object's temperature will remain constant and the heat will flow until the second object, hotter or colder, has changed its temperature to equal the other object's temperature.