The internal energy of a gas does not change in a free expansion.

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Presentation transcript:

The internal energy of a gas does not change in a free expansion. One type of adiabatic process is so-called free expansion in which a gas is allowed to expand in volume adiabatically without doing any work. No heat flows in or out (Q = 0), and no work is done because the gas does not move any other object. Thus, Q = W = 0 and by the first law of thermodynamics, DE = 0. The internal energy of a gas does not change in a free expansion.

2.6 Joule-Thomson effect throttle expansion ，p1＞p2 The experiment by Joule and Thomson showed that H of a real gas is not only the function of T, but also the function of p. 1 The experiment by Joule and Thomson p1,V1,T1 p2,V2,T2 Porous plug Adiabatic wall thermometer throttle expansion ，p1＞p2

James Prescott Joule 1818～1889