Momentum Change In Max Born's Atomic Physics

  • Thread starter terryphi
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Hello,

In Max Borns book Atomic Physics, in chapter 1, section 3, it reads
http://books.google.ca/books?id=NmM...rn atomic physics&pg=PA5#v=onepage&q&f=false"
"If we think of the molecules as billiard balls every molecule when it strikes the wall has its momentum changed by 2m*xi perpendicular to the wall.

I do not understand how it's momentum change by a factor of two, shouldn't it be the same but in the opposite direction?
 
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