- Application of the Zeroth law: Temperature measurements (thermometry)
- Bodies in thermal equilibrium: Have the same TEMPERATURE
- Heat: A type of energy which flows between two bodies due to a temperature gradient
- Heat reservoir: A system which is able to receive or lose any amount of heat without a change in temperature
- Temperature: A measurement of the degree of the average molecular kinetic energy of a body
- Thermal contact: When 2 bodies are in contact such that heat is able to flow from one to another
- Thermal equilibrium: When 2 bodies are in thermal contact but there is no NET transfer of heat between them
- Thermometry: The measurement of the temperature of a body
- Zeroth law of thermodynamics: If A is in thermal equilibrium with C and B is in thermal equilibrium with C, then A & B are also in thermal equilibrium