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PA7KK > INFO 16.07.02 12:23l 32 Lines 1393 Bytes #999 (0) @ WW
BID : 62824_PI8WFL
Read: DB0FHN GUEST
Subj: Re. VK3ABK
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Sent: 020716/0852Z @:PI8WFL.#NH1.NLD.EU #:62824 [Enkhuizen] $:62824_PI8WFL
From: PA7KK@PI8WFL.#NH1.NLD.EU
To : INFO@WW
VK3ABK's question and what I remember, they tought me at school:
>But specifically, what causes the balloon to rise, and for that matter the
>Goodyear blimp or the Hindenberg, before Lakehurst NJ in 1937! I estimate
>Lakehurst is about 100 km from Elizabeth and Point Pleasant Beach.
I assume a helium balloon rises because the total density (of molecules)
of the balloon is lesser than air. The gravity has lesser effect on an
object that is lesser dense. (We don't know what gravity is)
Hot air is lesser dense than cold air, so in the livingroom it is
hotter near the ceiling. There is timber that is very dense compared
with regular wood, so it sinks in water. In 1937 the german zeppelin
(designed by the count Zeppelin) used H2 gas which was very dangerous.
In Europe they want to build huge Zeppelins again for the (cheap) transport
of cargo.
>The same phenomenen applies to a sealed container in a tank of water. Why
>does the container rise to the surface, and then stop, and float.
The water is denser than the container. Because of this the container
rises. At the surface it meets the air which is lesser dense than
the container. At the surface there is a balance. If the container
would be filled with eg. water one could make a balance situation:
the container would not rise nor sink. (submarine)
73's - Henry PA7KK
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