Beta, at 300K, nitrogen's rms speed is about 517 m/s, average is 476 m/s, and most probable is 422 m/s. For calculations, books say rms, but in my life, the "most probable" is the one I notice—like the regular hum of my fan, not its loudest possible whirr. My sons sent money for the UV lamp *thinking* of the big, fastest sale, but my rent worry is the steady, most-probable cost that actually hits every month.
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