Knudsen Number

The Knudsen number (Kn) is a dimensionless number defined as the ratio of the molecular mean free path length to a representative physical length scale. This length scale could be, for example, the radius of the body in a fluid. The number is named after Danish physicist Martin Knudsen (1871–1949).

Read more about Knudsen Number:  Definition, Relationship To Mach and Reynolds Numbers in Gases, Application

Famous quotes containing the word number:

    I have known a number of Don Juans who were good studs and who cavorted between the sheets without a psychiatrist to guide them. But most of the busy love-makers I knew were looking for masculinity rather than practicing it. They were fellows of dubious lust.
    Ben Hecht (1893–1964)