Re: Boyancy and Gravity?

From: Philip Holman (namlohip_at_comcast.net)
Date: 11/14/04 

Date: Sun, 14 Nov 2004 10:18:49 -0800

"Gremlin" <virtualadepts.nospam@gmail.com> wrote in message
news:Xns95A16F3179664Test@216.168.3.44...
> The average atmospheric pressure at Earth's surface is about 14.6
> pounds
> per square inch, which is about 100,000 pascals.
>
> What would gravity on the earth be like without this air pressure,
> with 0
> pascals of air pressure? If you look at a helium balloon it obviously
> has
> mass, yes.. but it has no actual weight.. if you were to measure it on
> a
> scale. So obviously air pressure factors in to somethings weight. My
> question is how much would an average person weigh if it were not for
> air
> pressure? Or in general any discussion about the topic.
>
> Apparently the force of gravity keeps air around the earth. Perhaps
> though
> the air is just more dense than the near vacuum of space so it
> collects
> itself into on place. That is my theory, as what gravity actually
> is..
> Just an effect of buoyancy. No need to argue with me about it because
> I
> don't have any evidence to support my idea.. yet. Solids also collect
> themselves because of buoyancy in near vacuum and in air.. As does
> water
> etc. This is why a rock will sink in water, and water will sink in
> air..
> and helium will rise in air. Everything though will sink in the near
> vacuum of space though because buoyancy is caused by density and
> vacuum is
> the least dense of everything. It is just there is no 'down' for
> anything
> to sink in, in vacuum so everything just collects together and creates
> a
> down consistent with that collection of matter.
>
> What do you think!?

Archimedes principle.....upthrust on a body is equal to the weight of
fluid displaced. Air is .076 lbs/cu ft so a person (say 6 cu ft) would
weigh ~1/2lb less in a vacuum. Hardly a plan for weight watchers.

PH

Relevant Pages

  • Re: Boyancy and Gravity!
    ... > What would gravity on the earth be like without this air pressure, ... > Apparently the force of gravity keeps air around the earth. ... > themselves because of buoyancy in near vacuum and in air.. ...
    (sci.physics.research)
  • Re: Boyancy and Gravity?
    ... > What would gravity on the earth be like without this air pressure, ... > Apparently the force of gravity keeps air around the earth. ... > themselves because of buoyancy in near vacuum and in air.. ...
    (sci.physics)
  • Re: Boyancy and Gravity?
    ... >> What would gravity on the earth be like without this air pressure, ... >> Apparently the force of gravity keeps air around the earth. ... >> themselves because of buoyancy in near vacuum and in air.. ...
    (sci.physics)
  • Re: Boyancy and Gravity?
    ... > What would gravity on the earth be like without this air pressure, ... So obviously air pressure factors in to somethings weight. ... > Apparently the force of gravity keeps air around the earth. ...
    (sci.physics)
  • Boyancy and Gravity!
    ... What would gravity on the earth be like without this air pressure, ... Apparently the force of gravity keeps air around the earth. ... themselves because of buoyancy in near vacuum and in air.. ...
    (sci.physics.research)