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Gas impingement flux, problem in substituting constants

  1. Mar 22, 2013 #1
    1. The problem statement, all variables and given/known data
    gas impingement flux density is given by ∅=P/[itex]\sqrt{}2mkT[/itex]
    where m- mass of a molecule

    show that
    ∅=3.513*1022P/[itex]\sqrt{}MT[/itex]
    where pressure in torr and M-molar mass of molecule
    then ∅ in molecules per cm2 per second

    2. Relevant equations


    ∅=3.513*1022P/[itex]\sqrt{}MT[/itex]
    where pressure in torr and M-molar mass of molecule
    then ∅ in molecules per cm2 per second

    3. The attempt at a solution

    i substitute 1/133 to change pressure scale to torr and multiply by square root of Avogadro no and divide it by square root of 2∏k but i couldn't get appropriate constant. how derive the equation in given scale?
     
  2. jcsd
  3. Mar 22, 2013 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    It looks like you left out a factor of ##\pi## in the square root of the equation.

    Consider:

    What are the units of ∅ in the SI system?

    What are the units of m in SI system?

    What are the units of M?
     
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