A thermodynamic quantity is called a State Function if when a process occurs, the change in the value of that thermodynamic quantity depends only upon its value in the initial state and that in final state and does not depend upon the path by which change is brought about like mass, pressure, volume, temperature and internal energy are State Functions.
While as the thermodynamics quantity, the change in value of which depends upon the path followed during the process is known as Path Function. Heat, work are not state functions but path functions.
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