Quote: (Originally Posted by
cramerdn)
Actualy since V1 and V2 are equal you get P1/T1=P2/T2 or P1/P2=T1/T2
You can do it Bar and Kelvin or PSI and Rankin, whichever you prefer. For more acurate conversions you need Van Der Whals equations found in a P chem textbook but if you are only worried about changes in P for changes in T probably not worth the effort.
Almost there guys but.......
Gotta take in consideration the temperature of the tank body, the mass of the tank body (and valve), the specific heat of the tank body (depends upon material), the final temperature of the tank body and insulate the tank from giving off heat during the change of pressure.
This plus the gas in the tank, and the gas added since the ideal gas law does not always work out with our breathing gases and pressures.
All of this depends upon how accurate you want the answer.....
Tom