Asked in PMC Practice Test 7 (2021) 2021

When sudden expansion of gases takes place, cooling occurs. This is called _.

Correct answer: B. Joule Thomson effect

  • A. Freezing effect
  • B. Joule Thomson effect
  • C. Boyle's effect
  • D. J.Perrin effect

Explanation

Answer: B Joule Thomson effect is the phenomenon accompanying a change in temperature due to a rapid change in the volume of a gas (rapid expansion or rapid compression).

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About Real and Ideal Gases

An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.

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