Clausius Inequality

The Clausius Inequality is a fundamental concept in thermodynamics that relates to the direction of heat transfer and the concept of entropy. It states that during any spontaneous process, the change in entropy of a system plus the change in entropy of its surroundings is greater than or equal to zero. Essentially, it implies that energy tends to spread out and that systems naturally evolve towards a state of disorder. In simpler terms, heat flows from hot to cold, and this flow increases the overall disorder within a system and its environment.