For steady state flow through a throttling valve with negligible changes in kinetic and potential energies, the first law states that the enthalpy remains constant, that is, the isenthalpic process. The variation of temperature with pressure in such a process is known as the Joule-Thomson coefficient, . Show that the Joule-Thomson coefficient is given by (check the image).

The throttling process can cause an increase or decrease in temperature depending on the value of . Answer: What happens when 0?

=CP1[T(v/T)Pv]