Kinetic Theory

  1. http://en.wikipedia.org/wiki/Kinetic_theory#Pressure_and_kinetic_energy

    Based on the derivation for P in the above link, one of the early steps was:

    Δt = 2L/vx

    which is fine since it is analyzing one specific wall of the container, but then in the next step:

    F = Δp/Δt = mvx2/L

    And the 2 seems to disappear completely. Could anyone please explain why it is gone?
     
  2. jcsd
  3. Simon Bridge

    Simon Bridge 14,660
    Science Advisor
    Homework Helper
    Gold Member

    The 2 cancels with the expression for the change in momentum (1st line).
     
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