Fig. 2.30 The sign of the Joule–Thomson
coefficient, μ, depends on the conditions.
Inside the boundary, the blue area, it is
positive and outside it is negative. The
temperature corresponding to the
boundary at a given pressure is the
‘inversion temperature’ of the gas at that
pressure. For a given pressure, the
temperature must be below a certain value
if cooling is required but, if it becomes too
low, the boundary is crossed again and
heating occurs. Reduction of pressure
under adiabatic conditions moves the
system along one of the isenthalps, or
curves of constant enthalpy. The inversion
temperature curve runs through the points
of the isenthalps where their slope changes
from negative to positive.
Fig. 2.30 The sign of the Joule–Thomsoncoefficient, μ, depends on the conditions.Inside the boundary, the blue area, it ispositive and outside it is negative. Thetemperature corresponding to theboundary at a given pressure is the‘inversion temperature’ of the gas at thatpressure. For a given pressure, thetemperature must be below a certain valueif cooling is required but, if it becomes toolow, the boundary is crossed again andheating occurs. Reduction of pressureunder adiabatic conditions moves thesystem along one of the isenthalps, orcurves of constant enthalpy. The inversiontemperature curve runs through the pointsof the isenthalps where their slope changesfrom negative to positive.
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