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Joule Thompson effect

Joule Thompson effect

When a perfect gas flows through a throttling with constant inlet and outlet pressures, the temperature of the gas is the same before and after it flows through the throttling. There is a temperature drop, however, during the passage of gas through the throttling device itself. At this point internal energy is transformed into kinetic energy with an accompanying temperature drop. However, for real gases there is a sustained change in temperature, even though the energy content of the gas remains constant. This is called the Joule Thompson effect. (010)