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How to work out vacuum in in.hg

  1. Apr 7, 2009 #1
    im just wondering to work out vacuum in in.hg say if i have 3 1 letter bottles they have vacuums of 10 in.hg 20 in.hg 30 in.hg how much air will be in the bottles

  2. jcsd
  3. Apr 7, 2009 #2


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    Staff: Mentor

    Just ratio the densities to the density at atmospheric pressure.
  4. Apr 7, 2009 #3
    ok but what is the ratio
  5. Apr 7, 2009 #4


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    Science Advisor
    Homework Helper

    Atmospheric pressure at sea level is around 30 inches of mercury
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