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LF: RE: Re: Gas for balloons

To: [email protected]
Subject: LF: RE: Re: Gas for balloons
From: "James Moritz" <[email protected]>
Date: Fri, 27 Aug 2004 10:48:35 +0100
Importance: Normal
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]

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


In a message dated 27/08/2004 08:28:56 GMT Standard Time, [email protected] writes:

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.

Martin Maynard

Thanks Martin.


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.




David  G0MRF

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