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Modern vacuum pumps permit to pressures down to `p = 4.10^-15 atm` to be reached at room temperatures. Assuming that the gas exhausted is nitrogen, find the number of its molecules per `1 cm^3` and the mean distance between them at this pressure.

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`n=p//kT=1.10^(5)cm^(-3),gt l lt=0.2mm`.
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