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Air pressure variation with height

  1. May 27, 2009 #1

    I understand the thumb rule that " the pressure exerted by ten metres depth of water is approximately equal to one atmosphere". Is it applicable for pneumatic systems too ?? that with 10 m head difference in air pressure lines there would be 1 bar difference in pressure between the ends

    Please advise
    Last edited: May 27, 2009
  2. jcsd
  3. May 27, 2009 #2


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    10m of water weighs the same as all the air above your head - so 10m of air is unlikely to weigh the same.
    If the atmosphere is roughly 10,000m high then 10m head is about 10/10,000 of a bar different - otherwise you would need to decompress when standing up.
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