Dear David, LF group,
From what I remember of chemistry at
school, 1mole of gas at room temp and atmospheric pressure occupies 22.4 litres
of volume, and 1 mole of He weighs about 4g, whilst 1 mole of H2 weighs 2g. So
a cubic metre of helium will weigh about 180g, whilst the same amount of
hydrogen about 90g. Air is mostly nitrogen N2 at 28g/mole, so the air displaced
weighs about 1250g. So the increased buoyancy of the hydrogen will only give 90g,
about 7%, extra lift – ignoring the weight of the actual balloon itself.
What I would like to know is - what is a
good source for the balloons?
Cheers, Jim Moritz
73 de M0BMU
-----Original Message-----
From:
[email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: 27 August 2004 10:06
To: [email protected]
Subject: LF: Re: Gas for balloons
The
latest Maplin Catalogue is now offering a gas cylinder and 30 balloons
for £39.
As a matter of interest you might like to know that one cubic meter of
balloon gas will lift one kilo.
Regards
Martin Maynard
That's
an interesting fact.
I had
in mind something 'industrial' in scale - An advertising blimp etc.
Hence
the interest in the industrial scale of the gas supply, but good to know from
members of the group that balloon gas is widely available.
I
wonder how the lifting capability of Hydrogen compares to the balloon gas?
It has
several major disadvantages - small atomic size so it leaks quickly, not to
mention the real posibility of re-creating the Hindenberg disaster. but
it has the best lift capability.
