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At some altitude above the Earth’s surface, the density of air molecules is3.3×10^13 molecules/cm^3. At this...

At some altitude above the Earth’s surface, the density of air molecules is3.3×10^13 molecules/cm^3. At this altitude, the temperature is −44°C.

What is the mean free path of air molecules at this altitude? Assume a molecular diameter of 2.1×10^-8??.

What is the pressure at this altitude?

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Answer #1

Mean free path ( using )

where is number of molecules per unit volume,

is cross-sectional area ,

Diameter of air molecules

Temperature of air molecules

Mean free path is

Pressure at this altitude is

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