Knudsen number (Kn) is a dimensionless quantity used in fluid mechanics, defined by
where λ is mean free path and l is length.
Generalic, Eni. "Knudsen number." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table