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Maxwell speed distribution

by b.hessen
Tags: distribution, maxwell, speed
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b.hessen
#1
May16-12, 01:28 PM
P: 2
halo, Im stuck in an definite integral...

P(v)=4π (M2πRT)3/2⋅v2⋅e−Mv2nRT (maxwell speed distribution)

How can I calculate the fraction of Ar in mars?

pd. I got already the scape velocity

But... How can I intregrate and evaluate between (0, 5XE3 m/s) or (5XE3 m/s, infinite) ??

Is there any tables for evaluate this??

thanks
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clamtrox
#2
May17-12, 02:19 AM
P: 939
You can at least find tabulated values for the error function, erf(x) = 0x dx' exp(-x'^2). It might be easier just to plug in the numbers and integrate numerically, for example by using wolfram alpha.
b.hessen
#3
May17-12, 06:25 PM
P: 2
thanks...
I calculated in Origin 8.5 (five minutes) trapezoids area... 50 000 intervals... It work as well and "rough" solution, good for giving a fast solution.


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