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PE1OUD > INFO 18.07.02 20:02l 39 Lines 1384 Bytes #999 (0) @ WW
BID : C80842PE1OUD
Read: DB0FHN GUEST
Subj: Re: Balloons/Hot Air
Path: DB0FHN<DB0ZWI<DB0HDF<DB0ERF<DB0CHZ<OK0PKL<OK0PHL<OK0PPR<OK0PPL<RZ6HXA<
SP7MGD<SR3BGN<WB0TAX<PI8WFL<PI8WFL
Sent: 020718/1730Z @:PI8WFL.#NH1.NLD.EU #:63442 [Enkhuizen] $:C80842PE1OUD
From: PE1OUD@PI8WFL.#NH1.NLD.EU
To : INFO@WW
X-Info: uploaded with password authentication at PI8WFL.#NH1.NLD.EU
Hi,
VK3ABK wrote:-
> I asked about the specific reason why a helium filled balloon or 'airship'
> rises, and then included, a sealed container in water. This follows my
> pondering this observation some months ago. 'Why is it so'?
'A subject in a liquid suffers an upward force identical to the weight of
the displaced liquid'. That should ring a bell......
If said object is lighter than the displaced mass, it will float.
Example: a ship will float higher in salt water. Same ship, but the weight
of the displaced liquid changed and therefore the upward force.
> prevent it collapsing. Take the case of a rigid vessel ( as was the
> Hindenberg, incidently) and evacuate it. This eliminates gas mass from the
> problem. And, the 'balloon' still rises!
Same here. It would take some calculation but if you could evacuate a
rigid airship, such as 'Hindenburg', it would suffer an upward force
identical to the mass of the displaced air. If that would be enough?
YOU do the math............but the principle stands!
73 - Gerard, PE1OUD @ PI8WFL, Member of PWGN
(Packet Work Group Netherlands)
-Eagles may soar, but weasels don't get sucked into jet engines.
E-mail : pe1oud@amsat.org
Message timed: 19:26 on 18 Jul 02
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