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
[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
latest Maplin Catalogue is now offering a gas cylinder and 30 balloons
As a matter of interest you might like to know that one cubic meter of
balloon gas will lift one kilo.
an interesting fact.
in mind something 'industrial' in scale - An advertising blimp etc.
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.
wonder how the lifting capability of Hydrogen compares to the balloon gas?
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.