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thermal expasion of air

j.osborne
j.osborne Member Posts: 2
in THE MAIN WALL
how can i calculate the pressure change of air based on temperature change?
i have 1 cu ft of air at 15 psi and the temperature raises 100 degrees f. what is my end resulting air pressure psi?

Comments

  • Dave_23
    Dave_23 Member Posts: 190
    PV=nRT

    PV=nRT
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    Because air behaves as an ideal gas you can use a simple equation:

    P1 * V1 / T1 = P2 * V2 / T2

    P = pressure

    V = volume

    T = temperature

    Have messed this up. Pressure, volume and temp must be kept on the same relative scale.



  • zeke
    zeke Member Posts: 223


    You must use absolute temps in the gas equations. The 70 deg F = 460+70 =530 R and the 170 F is 630 R. Also the pressures must also be absolute, psia not psig.
    psia= psig +14.7
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    Thank you. Made it even worse and removed the calculations. Sorry.


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