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Topic: Maxwell velocity distribution calculation  (Read 3518 times)

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Offline diablo

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Maxwell velocity distribution calculation
« on: October 19, 2009, 04:41:06 PM »
Hi folks,

got another problem regarding the max.vel.distr.:

Calculate the amount of N2 molecules which have a velocity of 295 +/-5 (m/s) at 500K. (velocity interval = infinitesimal).

this calculation should be easy: f(v) * dv

f(v).. the formular of max.ve.distr.
d(v) . +/-5 m/s

The problem is: when i calculate the e^-Mv2/2RT Term i always get zero.
M . 28g/mol
v....295m/s
R.... 8,31x10^-2
T= 500K

what am i doing wrong ?

Offline Yggdrasil

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Re: Maxwell velocity distribution calculation
« Reply #1 on: October 19, 2009, 06:30:28 PM »
Check the units of your calculation, especially for R.  You'll find your problem there.  (remember that 1 J = 1 kg m2 s-2)

Offline diablo

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Re: Maxwell velocity distribution calculation
« Reply #2 on: October 20, 2009, 10:00:03 AM »
oh yes, 0,028kg/mol and 8,31J/kmol  ;D

thx for your help

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