Re: HVAC questions

[John Barrer <forcejb@YAHOO.COM>]

You can also (more "profitably"??) express pressure as
energy per unit volume; this disconnects the concept
from a "surface-only" phenomenon. John Barrere
--- cliff parker <cparker@CHARTER.NET> wrote:
> > > However when hot air is unconfined in the
> atmosphere what acts as the
> > > surface of the balloon?
> >
> > Key idea:  Air is a fluid.  It has a pressure
> everywhere.
> > Pressure is not something that happens just at
> surfaces.
> > Each parcel of fluid pushes on the neighboring
> parcels
> > of fluid.
>
> I knew this and was thinking something along these
> lines.  I have difficulty
> visualizing this idea.  Pressure equals force per
> unit area.  Seems like a
> surface is an necessity.
>
> Interesting ideas in your website.  I intend to read
> it more thourouly.  One
> statement said that each air molecule collides with
> one or another of its
> neighbors 10,000,000,000 times per second.  How is
> something like this
> determined?
>
>
> > Again: P = (N/V) kT
> > Same pressure, same temperature ==> same number
> > per volume.  Then less mass per particle ==>
> > less mass per volume.
> >
> > The H2O molecule is a lot less massive than N2.
> >
> > Humidity rises for the same reason a helium
> > balloon rises.
>
> Would unconfined helium rise just as well as
> confined helium?
>
>
> > At ordinary temperatures, you would need a
> > container many miles high in order to see
> > much fractionation of the atmosphere.  (And
> > you would need to suppress convection, etc.)
>
> Doesn't this last statement conflict with the
> previous idea that the less
> massive H2O rises to the ceiling of a room (much
> less than many miles high).
>
>
> > This posting is the position of the writer, not
> that of Brown,
> > Einstein, Smoluchowski, or Nernst.
>
> I like your disclaimers.
>
> This posting represents the questions of the writer
> and very likely those of
> Brown, Einstein, Smoluchowski, Nernst and Denker at
> some time in their life.
>
> This posting is the position of the writer, not that
> of SUNY-BSC, NAU or the AAPT.


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This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.