Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Density of compressed air

  1. Apr 7, 2009 #1
    does anyone happen to know the density of compressed air?
  2. jcsd
  3. Apr 7, 2009 #2


    User Avatar
    Science Advisor

    It's whatever I want it to be.
  4. Apr 7, 2009 #3


    User Avatar
    Science Advisor
    Homework Helper


    Start with the density of normal air then multiply by however many atmospheres of pressure it's under.
  5. Apr 7, 2009 #4
    you should start with

    pV = mRT, divide by (V R T), and you get

    m/V = p/RT.

    p - pressure [Pa], V - volume [m3], m - mass [kg], R - gas constant (287 kJ/kg), T - temperature [K]

    note that this is for ideal gas and so only accurate for high temperatures (room) and low pressures (up to 40, 50 bar).

    check out this page: http://en.wikipedia.org/wiki/Compressibility_chart
  6. Apr 7, 2009 #5
    For 1 atm (760 mm Hg, or ~100,000 Pa) dry air at 20 deg C, the density is about 1.20 kilograms per cubic meter.
  7. Apr 7, 2009 #6
    >0.0 kg/m3
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook