State functions, also called "state variables",thermodynamic variables, state quantities, or functions of state, describe the momentary condition of a thermodynamic system. For a passage from one given thermodynamic state to another, whatever may be the intermediate conditions between the initial and final thermodynamic states, the total change in the value of any thermodynamic state variable will be the same. For a continuous process, this means that incremental changes in such variables are exact differentials, fully determined by their initial and final thermodynamic states.
Examples include entropy, pressure, temperature, volume, etc.
Various thermodynamic diagrams have been developed to model the transitions between thermodynamic states.
Read more about this topic: Thermodynamic State
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