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A multiple-choice question about the theoretical basis of gas dynamics in college physics
The answer is c, ignore Baidu.

Firstly, the relationship between pressure P and root mean square velocity V is deduced: P = (n/3) v 2, where n is the molecular number density.

Therefore, P is proportional to V 2, because the ratio of V is 1:2:4, so its square ratio is 1:4: 16, so the pressure ratio is 1:4: 16.