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A property of a system that is determined by the state or condition of the system and not by how it got to that state; its value is fixed when temperature, pressure, composition, and physical form are specified. A state function, then, is a function that is dependent on state variables. A state variable is a characteristic that defines the set of conditions a given system is under. For example, temperature and pressure are both variables that you are likely to find in a state function.

Chemistry includes state functions such as the equations for pressure, volume, temperature, enthalpy, entropy, etc.

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