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Define the state function and state vari...

Define the state function and state variables. Give examples.

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The thermodynamic properties whose values depend only on the initial and final state of the system and are independent of matter or the manner as to how the change is brought about are called state functions.
In thermodynamics some common state functions are internal energy (U), enthalpy (H), entropy (S), Gibbs energy (G), pressure (P), temperature (T), volume (V) etc.
Variables such as P.V.T are called state variables. These are used to describe the system completely.
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