Last Updated
：2025/12/03
Knudsen number
Noun
Japanese Meaning
Knudsen数：物理学において、平均自由行程（分子が他の分子と衝突するまでに自由に進む平均距離）と、流体が通過する開口部や代表寸法との比率を表す。
（ plural ）
Quizzes for review
(physics) The ratio between mean free path and aperture size used as a parameter in describing Knudsen flow.
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Knudsen number
When the Knudsen number exceeds about 0.1, gas flow through the aperture transitions into a rarefied regime where molecular collisions with the walls dominate.
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When the Knudsen number exceeds about 0.1, gas flow through the aperture transitions into a rarefied regime where molecular collisions with the walls dominate.
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