Question: Oxygen is enclosed at the temperature 0 C in a vessel with the characteristic dimension l = 10 mm (this is the linear dimension determining

Oxygen is enclosed at the temperature 0 °C in a vessel with the characteristic dimension l = 10 mm (this is the linear dimension determining the character of a physical process in question). Find:
(a) The gas pressure below which the mean free path of the molecules λ > l;
(b) The corresponding molecular concentration and the mean distance between the molecules.

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