Zeroth law of thermodynamics is related to:

CONCEPT:

Zeroth Law of Thermodynamics

• The Zeroth Law of Thermodynamics deals with the concept of thermal equilibrium.
• It states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
• This law forms the basis for the definition of temperature.
• It implies that temperature is the property that determines whether a system is in thermal equilibrium or not.

EXPLANATION

• The Zeroth Law provides the foundation for the measurement of temperature.
• It allows us to use a thermometer as the third system to measure the temperature of other systems.
• Temperature: This is the correct answer, as the Zeroth Law establishes the concept of temperature as a measurable property.

Therefore, the correct answer is Temperature.