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Oxygen is enclosed at the temperature 0 ...

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 `lamda gt l` ,
(b) the corresponding molecular concentration and the mean distanace between the molecules.

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