How to work out vacuum in in.hg

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To calculate the amount of air in bottles with varying vacuums measured in inches of mercury (in.hg), one can use the density ratios relative to atmospheric pressure, which is approximately 30 in.hg at sea level. For bottles with vacuums of 10 in.hg, 20 in.hg, and 30 in.hg, the air volume can be determined by comparing each vacuum level to the atmospheric pressure. The discussion emphasizes using these ratios to find the air density in each bottle. Understanding these calculations is crucial for accurate measurements in vacuum applications. This method provides a straightforward approach to quantify air content in vacuum conditions.
deathlucky
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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

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Just ratio the densities to the density at atmospheric pressure.
 
ok but what is the ratio
 
Atmospheric pressure at sea level is around 30 inches of mercury
 

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