2.49. For a gas that follows the van der Waals equation of state, the inversion temperature can be approximated as 2a/Rb. Using Table 1.6, calculate the inversion temperatures of He and H2 and compare them to their values of 40 K and 202 K, respectively. What are the implications of these inversion temperatures with regard to liquefaction of these two gases? Concept introduction: The phenomenon in the change of temperature produced when a gas is made into expands adiabatically from a region of high pressure to the region of low pressure is called Joul-Thomson effect. The mathematical derivation for the Joule –Thomson effect is called the Joule Thomson coefficient.

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Chapter 2, Problem 2.49E

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2.49. For a gas that follows the van der Waals equation of state, the inversion temperature can be approximated as 2a/Rb. Using Table 1.6, calculate the inversion temperatures of He and H2 and compare them to their values of 40 K and 202 K, respectively. What are the implications of these inversion temperatures with regard to liquefaction of these two gases?

Concept introduction:

The phenomenon in the change of temperature produced when a gas is made into expands adiabatically from a region of high pressure to the region of low pressure is called Joul-Thomson effect. The mathematical derivation for the Joule –Thomson effect is called the Joule Thomson coefficient.

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