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how to work out vacuum in in.hg

 
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Apr7-09, 07:52 PM   #1
 

how to work out vacuum in in.hg

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

cheers
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Apr7-09, 08:11 PM   #2
 
Mentor
Just ratio the densities to the density at atmospheric pressure.
Apr7-09, 09:59 PM   #3
 
ok but what is the ratio
Apr7-09, 10:26 PM   #4
 
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how to work out vacuum in in.hg

Atmospheric pressure at sea level is around 30 inches of mercury
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