write ths equation of mean collision time.
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The mean free path equation depends upon the temperature and pressure as well as the molecular diameter. and times the average molecular separation of x 10^ m
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Collision Times
Consider collisions between particles of type  (with number density  and mass  ), possessing the Maxwellian distribution function
(3.167)
and particles of type  (with number density  and mass  ), possessing the Maxwellian distribution function
(3.168)
Here,  is the common temperature of the two species, and  is the mean drift velocity of species  relative to species  . As we saw in the previous section, collisions with particles of type  give rise to a velocity-dependent force acting on individual particles of type  . This force takes the form [see Equation (3.165)]
(3.169)
where  and  . The net force per unit volume acting on type  particles due to collisions with type  particles is thus
(3.170)
Suppose that the drift velocity,  , is much smaller than the thermal velocity,  , of type  particles. In this case, we can write
(3.171)
Consider collisions between particles of type  (with number density  and mass  ), possessing the Maxwellian distribution function
(3.167)
and particles of type  (with number density  and mass  ), possessing the Maxwellian distribution function
(3.168)
Here,  is the common temperature of the two species, and  is the mean drift velocity of species  relative to species  . As we saw in the previous section, collisions with particles of type  give rise to a velocity-dependent force acting on individual particles of type  . This force takes the form [see Equation (3.165)]
(3.169)
where  and  . The net force per unit volume acting on type  particles due to collisions with type  particles is thus
(3.170)
Suppose that the drift velocity,  , is much smaller than the thermal velocity,  , of type  particles. In this case, we can write
(3.171)
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