Zeroth Law of Thermodynamics

Zeroth Law of Thermodynamics

If two systems are separately in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

### Formula

$$T_1=T_2=T_3$$

### Terminologies

- T → Temperature.

### Conditions / Special Cases

Thermal equilibrium means no net heat flow occurs.

### Usage

- Basis of temperature measurement.