The Joule-Thomson effect is used to _ the temperature of a gas to liquefy it.
Correct answer: D. Lower
- A. Raise
- B. Higher
- C. Equalize
- D. Lower
Explanation
The Joule-Thomson effect is used to lower the temperature of a gas to liquefy it. This is because when a gas is expanded adiabatically (without heat exchange), the gas molecules will collide less frequently, which will cause them to lose energy. This loss of energy will cause the temperature of the gas to decrease. The Joule-Thomson effect is not always used to liquefy gases. For some gases, the Joule-Thomson effect will actually cause the temperature of the gas to increase. These gases are called Joule-Thomson inversion gases. So, the answer is lower.
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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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