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Joule-Thomson Effect Calculation Excel . K/mpa) is 3.7 at 0.1 mpa, 2.6 at 10 mpa.(temperature is 300 k.) when i open up the cylinder valve, 10 mpa argon in the cylinder will expand into 0.1 mpa atmosphere. For a gas temperature that is above the inversion temperature, the μjt would be negative. 11.1 INTRODUCTION from iqraphysics.com This coefficient can be expressed in terms of the gas's volume , its heat capacity at constant pressure , and its coefficient of thermal expansion as. For η jt > 0, temperature decreases, and for η jt < 0, temperature increases during an expansion. The adiabatic (no heat exchanged) expansion of a gas may be carried out in a.