Diffusion takes place in the gas phase by the random motion of gas molecules. The thermal motion of gas particles at above absolute zero temperature is called molecular diffusion. Since, molecular diffusion occurs as a result of thermal motion of the molecules, it proceeds at a maximum rate in gases, at a lower rate in liquids, and at a still lower rate in solids.
The diffusion rate can be calculated by t=x²/(2D)
How to calculate the diffusion of gas at a particular distance?
Apply,
time= x²/(2D)
where
D= Diffusion constant = 10 ↑ -9 m²/s
x= distance =15 mm = 15 * 10↑-3 m
then, substitute
t= (15*10↑-3)²/2*10↑-9
=112.5 * 10↑ -3 sec
Thus, Diffusion of gas at a particular distance is
t =3.125* 10↑-5 hours
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