Zeroth Law of Thermodynamics

The Zeroth Law of Thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. In simpler terms, if System A has the same temperature as System C, and System B has the same temperature as System C, then A and B must also share the same temperature. This principle establishes the concept of temperature as a measurable, consistent property and forms the foundation for temperature measurement tools like thermometers. It helps us understand how temperature relates to the balance of heat between systems.