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G0TEZ > INFO 22.07.02 00:08l 58 Lines 2926 Bytes #999 (0) @ WW
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Subj: Re: RE - BALLOONS
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To : INFO@WW
G0TEZ/TPK 1.83c Num 240 21-07-02T20:39:24 GMT: COLNE,Lancs:
Hello Ray and others.
On your first topic, the lift of an aerofoil, the great majority of lift
comes from the shape but it can't be stated as 2/3 because it varies
according to speed and the shape of the wing. Many people do think that
lift is caused by an aeroplane wing striking the air at an angle but it
just isn't so. It is almost entirely die to the lower perssure over the top
of the wing. If you look at most modern aircraft you will see small wingtip
fins which are there to prevent air from below the wing reaching the upper
surface over the wing tip. Some of the increased pressure below the wing
does come from airflow but, if you looked up Bernouilli while you were
checking on Dalton, you'll see what I was talking about.
>encyclopoedia under the heading 'Daltons Law of Partial Pressures'. It is
>a simple fact that gasses at normal pressures and temperatures dont
>stratify in either the atmosphere, or in a sealed container. Helium doesnt
>rise to the top of the atmophere. Its distribution is the same as if no
>other gas were present. In my opinion, that of a voice in the wilderness,
It is an observable phenomenon that, mixtures of fluids do stratify. Take,
for example, the flaming drinks like Gletscher Eis or try pouring alcohol
or methylated spirit on to water. The alcohol will float on top and burn
quite happily until used up, something it wouldn't do if it just mixed.
If we leave out latent heat, a subject on it's own, some elments like
water can exist as solid, fluid or gas and, in all three forms, they do
stratify. The ice near the surface of a glacier flows over the more dense,
lower ice, water flts on or, as with the alcohol, sinks below other fluids,
steam rises in air.
Partial pressure is the pressure produced by one gas in a mixture, e.g., the
partial pressure of oxygen in air.
As for the ozone layer, there are many theories ranging from burning rain
forests to cow's farts (methane) but the generally accepted reason is the
way that Oxygen O2 converts to Ozone O3 in the prescence of UV light from
the sun and back again during the night. This is adversly affected when a
high concentration of Fluorine is present from OxyFuorohydrocarbons, which
were used in refrigerators and to pressurise sparay cans. The combination of
Oxygen with Fluorine prevents the formation of Ozone and thence we get an
Ozone layer.
Please don't flame me on this one as chemistry is by far my weakest subject.
The explanation I've tried to give was from a TV science programe a few
years ago. The sight of a complex molecule terrifies me!
All the best *
/
~/~
-----73---Ian.
"" ...............""""""
PEACE ON YOU MAN
iang0tez@fsmail.net
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