Unformatted text preview: THE JOULE—THOMPSON EXPERIMENT p :[61‘]
H If ,u. > 0 then this indicates that the gas cools when expanded (-ve AP).
If ,u < 0 then this indicates that the gas cools when compressed (+VB Ap). The ”inversion temperature" indicates where on a 3]}; plot y ﬂips from +VB to —Ve.
For a real gas p: is non-zero (except at the inv ersicn temperature) and thus H shows some v ariation with p. Upper
: temperature Heat
temperature Hydrogen ...
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- Fall '10