Bloggers Wanted
We're looking for people to help with the main blog. If you are consistent, knowledgeable and you're into it, please drop me a note.
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David S
 Fresh Boarder
Posts: 13 
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Can anyone please provide me the theory of how to calculate a small hot air balloon for radio purpose. I need examples for volume/lift, temp difference, fabric types,
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etitor
 Fresh Boarder
Posts: 17
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Lift is equal to 'the weight of the fluid displaced'. The balloon has to lift itself, including the weight of the gas in it. Air has an average molecular weight of 29 grams. So 1 mole, 6.023*10^23 molecules weighs 29 grams at STP. PV=nRT will allow you to convert to other Temperatures and volumes.
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Razbyshaka
 Junior Boarder
Posts: 25
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