Re: vacuum of space

From: Sam Wormley (swormley1_at_mchsi.com)
Date: 06/29/04 

Date: Tue, 29 Jun 2004 20:43:47 GMT

Sam Wormley wrote:
>
> Mike Thomas wrote:
> >
> > Why don't atmosphereic gases get sucked into space considering the vacuum
> > pressure involved that surrrounds us?
>
> Gravity
>
> Actually some gas (hydrogen, helium come to mind) atoms and molecules
> can attain escape velocity and do escape the Earth.

  BTW there is no "vacuum pressure"... atmospheric pressure comes from the
  weight of the atmosphere, caused by the Earth's gravity.

  Escape Velocity
    http://scienceworld.wolfram.com/physics/EscapeVelocity.html

  Atmospheric Pressure
    http://scienceworld.wolfram.com/physics/AtmosphericPressure.html

  Pressure
    http://scienceworld.wolfram.com/physics/Pressure.html

Relevant Pages

  • Re: The weather and the many different factors that drive it...
    ... > winds travel upwards and suck air away from the surface of the Earth ... > like a giant vacuum cleaner, decreasing the air pressure above the ... > the levels in the atmosphere involved. ... > Troposphere where in reality the Stratosphere has a part to play. ...
    (sci.geo.meteorology)
  • Re: O2
    ... You can't use the ideal gas law for a liquid. ... pressure calculations, ... atmosphere is subject to fluid dynamics). ...
    (rec.aviation.student)
  • Re: Is it this easy to live on Earth?
    ... and its atmospheric pressure is 101.3 kpa. ... and Mars' atmosphere obtains a lesser figure - the sum of all figures ... also means that Venus already has nitrogen and mineral salts to work ... For Venus you need 278 tonnes for every 10 tonnes useful payload ...
    (sci.space.policy)
  • Re: Reply to Eric Rowley -- Ozone
    ... pushing all the heat in a large area into a smaller area. ... temperature is higher, but there is no actual new heat energy in the ... If this is correct, then pressure is not a heat source, as no ... We can move it around the atmosphere. ...
    (talk.origins)
  • Re: Mercury
    ... you have a largely carbon-dioxide atmosphere at Earth normal pressure, ... and temperature masses 1.26 kg/m3 - and since a carbon-dioxide ... Venus and how it changes with altitude. ...
    (sci.space.policy)