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B Pressure of weightless fluids

  1. Feb 20, 2017 #1
    Is the pressure of gas at any point within mostly due to particles collisions rather than weight of gas above point considered?
  2. jcsd
  3. Feb 20, 2017 #2


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    What is the atmospheric pressure at sea level ? What is the atmospheric pressure at 5 miles up ? What is the difference between "due to particle collisions" and "due to weight of gas above" ?
  4. Feb 20, 2017 #3
    The pressure is always exclusively due to particle collisions. The weight of the gas above only changes the frequency of particle collisions, by changing the number of particles per unit volume.
  5. Feb 22, 2017 #4
    So for a gas confined in a balloon in non gravitational field the pressure of the gas at any point will not change considerably than in case if in gravity field,while this is not the case in liquids ,is this right?
  6. Feb 22, 2017 #5
  7. Feb 22, 2017 #5
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