Discussion
Consider the following statements about the Joule-Thomson inversion temperature.
1. Below it, throttling cools the gas.
2. Above it, throttling warms the gas.
3. Hydrogen and helium have inversion temperatures above room temperature.
Answer: A
The first two are correct. The third is wrong and the error matters: both gases have inversion temperatures far below ambient, so they must be precooled before throttling can liquefy them. Liquid nitrogen is the usual precooling medium.
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