Q: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?


Read this paragraph and choose the correct option from the provided answers:

Check Your Learning Ammonia can be liquefied by compression at room temperature; oxygen cannot be liquefied under these conditions. Why do the two gases exhibit different behavior? Answer: The critical temperature of ammonia is 405.5 K, which is higher than room temperature. The critical temperature of oxygen is below room temperature; thus oxygen cannot be liquefied at room temperature.

 Choices:

- relaxed temperature

- leading temperature

- particular temperature

- critical temperature


A:
critical temperature