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# The Joule Thomson Effect - Thermodynamic Chemistry Notes | EduRev

## Physical Chemistry

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## Chemistry : The Joule Thomson Effect - Thermodynamic Chemistry Notes | EduRev

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The Joule Thomson Effect

The phenomenon of change of temperature produced when a gas is made to expand adiabatically from a region of high pressure to a region of externally low pressure is known as the Joule-Thomson Effect.
The ratio of change in temperature w.r.t. change in pressure at constant enthalpy is known as JouleThomson coefficient.  This experiment is known as Joule Thomson experiment. Suppose a certain amount of gas is passed through the porous plug.  We than have
Change in volume on the left hand side = – V1
Work involved on the left hand side = P1V1
Change in volume on right hand side = V2
Work involved on the right hand side = – P2V2
Net work involved in the system = – P2V2 + P1V
Because the process is adiabat ic, dq = 0 then from first law
We have, dq = dU – ω = 0
dU = ω
or U2 – U1 = – P2V2 + P1V1
U2 + P2V2 = U1 + P1V1
or
H= H1
i.e., adiabatic process is isoenthalpic in Joule-Thomson experiment.
Joule Thomson coefficient is represented by  mJ.T and is equal to We now that,
H = H(P,T)      We know that then we have,  i.e.  Inversion temperature: The temperature at which the Joules-Thomson coefficient changes sign is known as the inversion temperature. Another words, inversion temperature is the temperature at which real gas behave ideally.
We know that μJ .T. = 0 for ideal gas  ⇒  Where Ti is known as inversion temperature.

Zeroth law of thermodynamics: “If body A is in equilibrium with body B is also in equilibrium with body C, then bodies A and B are in equilibrium with each other.”

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