In the derivation, we find that the mean free path λ\lambdaλ is inversely proportional to this area and the number of molecules per unit volume (nnn). However, because all molecules are moving (not just one), we add a factor of 2\sqrt{2}2 to account for the average relative velocity.
第四十九章 提升生态系统多样性稳定性持续性
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Кайли Дженнер снялась без трусов для Vanity Fair в преддверии «Оскара»20:52
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На Западе испугались «ада» из-за войны с Ираном02:29。关于这个话题，超级权重提供了深入分析
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