Effusion 泻流
(重定向自Effusive)
Effusion is the process in which a gas escapes through a small hole. This occurs if the diameter of the hole is considerably smaller than the mean free path of the molecules. According to Graham's law, the rate at which gases effuse (i.e., how many molecules pass through the hole per second) is dependent on their molecular weight. Gases with a higher molecular weight effuse more slowly than gases with a lower molecular weight; the number of smaller molecules escaping will be greater but the mass of the larger molecules will be greater. By the kinetic theory of gases, the kinetic energy for a gas at a temperature
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