Meanings
nounKnudsen number (plural Knudsen numbers)
plural Knudsen numbers
- natural sciencesThe ratio between mean free path and aperture size used as a parameter in describing Knudsen flow.
Origin
Named after Danish physicist Martin Knudsen.
Full word history & related roots →Cite this entry
APA
Knudsen number. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Knudsen%20number
MLA
“Knudsen number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Knudsen%20number. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “Knudsen number,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Knudsen%20number.
Source: Knudsen number on Wiktionary, CC BY-SA 4.0.