I.4 State of a system and state quantity

I.4 State of a system and state quantity

The thermodynamic state of a system is represented by macroscopic quantities relating to the microscopic state of the matter making up the system. All macroscopic quantities macroscopic quantities, whether directly measurable or not, that can describe the state of a system are called state quantities.

Example

Volume (V), pressure (P), temperature (T), mass (m)...etc.