Explanation:
When a substance is heated then its molecules gain kinetic energy and they start to collide rapidly with each other.
As a result, when we place another object of a lower temperature then molecules of the hotter object tends to lose excess of energy.
Hence, this energy is transferred to the adjacent colder object. This means that heat flows from a hotter object to a colder object.
Thus, we can conclude that heat always flows from a hotter place to a colder place.
