Calculating pressure of air pocket in a pressurized water column

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To calculate the pressure of the air pocket in a pressurized water column, it's essential to clarify the setup: a 2-inch vertical pipe, capped, containing 2 inches of air at the top and 40 psi of water at the bottom. The pressure measurement of 40 psi is taken at the bottom of the 24-inch tall pipe. As the water rises, the pressure decreases due to the height of the water column. The pressure drop can be calculated using hydrostatic pressure principles, factoring in the height of the water column and the density of the water. Understanding these elements will provide clarity on the pressure dynamics within the system.
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Calculating pressure of air pocket in pressurized water column.
Looking for some guidance in calculating pressure of air pocket in pressurized water column. Example: 2" vertical pipe, capped, with 2" of air and 40 psi water applied.
 
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Presumably the air bubble is at the top of the column, right? Where are you measuring the 40psi water pressure? At the top or bottom of the water column? How tall is the pipe?
 
Water supply line pressure is 40 psi, air is at top of 24" column, where it is being read.
 
So the 24" tall pipe has 40psi water at the bottom. How much does the pressure drop going up that water column...? :smile:
 

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