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Pressure of helium

  1. Nov 30, 2009 #1
    Is it easy to compress helium,not into a tank,just enough to make it heavier than air?and how much weight can it lift per cubic meter under normal atmospheric pressures? please can someone help!
     
  2. jcsd
  3. Nov 30, 2009 #2

    Q_Goest

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    Depends on what you mean by "easy". For any given increase in pressure, the temperature of helium will be higher than air. It's also more difficult to seal than air. However, the same techniques used to compress air can be used to compress helium.

    To get the density of helium equal to that of air, it must be compressed to roughly 107 psia. Normally, this requires 2 stages of compression.

    Density of helium at 14.7 psia and 70 F is .0103 lbm/ft3, compared to air which is .0749 lbm/ft3.
     
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