Bloomfield, Philip E. Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania; City College, City University of New York, New York, New York
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A thermodynamic process in which the system undergoing the change exchanges no heat with its surroundings. An increase in entropy or degree of disorder occurs during an irreversible adiabatic process. However, reversible adiabatic processes are isentropic; that is, they take place with no change in entropy. In an adiabatic process, compression always results in warming, and expansion always results in cooling. See also: Entropy; Isentropic process
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