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#1




volume of air under presssure compared to volume with no pressure.
I am trying to find the equation for determining the amount of air at atomasphere compared to air underpressure. In other words, I have a 1 square foot of a under pressure at 10 psi. What would the volume be if it was not under pressure, ie at atomasphere. I do realize that I would need to know the current barometric pressure.
Thankyou 
#2




Re: volume of air under presssure compared to volume with no pressure.
You would use the ideal gas law.
If temperature changes as well: (Pi * Vi) / Ti = (Pf * Vf) / Tf Or if temperature stays constant: Pi * Vi = Pf * Vf P = pressure, V = volume, T = temperature i = initial, f = final One problem I see is that you list the volume in square foot, a volume would be a unit such as cubic foot. Another problem I see is that 1 atmosphere = 14.6959488 psi which would make your final pressure more than your initial pressure, unless the initial pressure is gauge, which I assume it is. 
#3




Bullette at 23 kg/cm2 of pressure having 73 m3 of volume then what will be the mass ?
Bullette at 23 kg/cm2 of pressure having 73 m3 of volume then what will be the mass of that pressure ? please reply

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