EntityQ898463· pop 24· linked from 122 articlesKnudsen numberSign in to savequotient of the mean free path of a particle and a characteristic lengthConnectionsideal gasEntityUnited StatesCountryDenmarkConceptNorth KoreaCountryuraniumEntityInternational Standard Book NumberEntityInternational System of UnitsEntityatmosphereEntityartificial satelliteEntityisotopeEntityaircraftEntityradiusEntitydigital object identifierEntitydustEntityfluid mechanicsEntityaerodynamicsEntityviscosityEntityArchimedes' principleEntitymolar massEntityBoltzmann constantEntityCategoriesDimensionless numbers of fluid mechanicsFluid dynamics