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M1BYT > INFO 24.07.02 13:09l 39 Lines 1742 Bytes #999 (0) @ WW
BID : C20576M1BYT
Read: DB0FHN GUEST
Subj: Re: re; balloons the finale
Path: DB0FHN<DB0ZWI<DB0CHZ<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<7M3TJZ<N0WJP<VK3AVE<
GB7FCR
Sent: 020724/1057Z @:GB7FCR.#16.GBR.EU #:4509 [Blackpool] FBB-7.03a $:C20576M1B
From: M1BYT@GB7FCR.#16.GBR.EU
To : INFO@WW
VK5BWF Opined with considerable skill:-
> HI, Dick said the lift is due to a difference in pressure, he mentioned the
> difference at low and high altitude. I am no physicist ,but I don't agree.
> I think the difference in pressure between the bottom and top of the object
> is the factor causing the lift,this is due to the weight of the fluid that
> has been displaced.I imagine a small helium ballon would still rise to the
> top of a sealed air tank, or an air filled float would rise to the top of
> an otherwise completely full and sealed water tank.An expandable helium
> ballon will swell at high altitude due to the internal pressure and hence
> tend to maintain the lifting force.
Hi Trev,
This is also the way I understand the principle.
High altitude balloons are only partially filled on the ground, to allow
them to expand as they rise to higher altitudes.
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º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU.GBR º
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º International Museums Weekend 15+16th June 2002 º
º www.ukradioamateur.org/imw/index.html º
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º RAE CD ROM course Project and the Newcomers Intro º
º to amateur radio:- http://www.ukradioamateur.org/ º
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º QTH: Garforth, W. Yorks.. º Timed 10:52 º
º harry_m1byt@ntlworld.com º 24 Jul 2002 º
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