Clausius statement

The Clausius statement is a principle from thermodynamics that asserts that heat cannot spontaneously flow from a colder body to a hotter body. In simple terms, this means that if you have two objects at different temperatures, heat will always move from the hotter object to the cooler one, not the other way around, unless work is done on the system. This idea underpins many aspects of energy transfer and helps establish the direction of natural processes, highlighting the tendency towards greater disorder or entropy in systems.