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Average Speed in Kinetic-Molecular model

  1. Nov 19, 2015 #1
    Hello,

    In the Kinetic-Molecular model for gas molecules in a container it is assumed that the square of the x-y-z velocity components is the same, how is it possible that we assume this?
     
  2. jcsd
  3. Nov 20, 2015 #2
    Why would you feel that one component should be more, or less, than another?
    By the way, the assumption is made of the average value of the squares of the components of the velocity.
    Also, it is an assumption when the topic is taught at a basic level. In advanced course in statistical physics, it is proved. It is called the theorem of equipartition.
     
  4. Nov 20, 2015 #3
  5. Nov 20, 2015 #4
    Thanks for the replies, I can see why this is the case now.
     
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