State Functions: Summary

The answers to the ConcepTests are given below and will open in a separate window. 
Key points from this module:
  • State function changes are independent of path.
  • Temperature, pressure, volume, enthalpy, internal energy, entropy, Gibbs free energy, Helmholtz free energy are examples of thermodynamic state functions.
  • Heat and work are not state functions; they do depend on the process pathway.
From studying this module, you should now be able to:
  • Use state functions to solve energy balances.
  • Use the concept of state functions to calculate changes in state parameters.

Prepared by John L. Falconer, Department of Chemical and Biological Engineering, University of Colorado Boulder