For a balloon to float (in air) the balloon must be filled with something lighter than air. Helium, hydrogen, are two common gasses that will work. The pressure in the balloon is just modestly above atmospheric (to stretch the rubber). A balloon filled with air falls to the ground. A tank of compressed air indeed weighs more than a air tank with a open fitting balancing internal and external pressure. 0.076lb per Cubic foot for 60 degree air at sea level. 0.456lb per cubic foot for 60 degree air at 75psi (Rock Excavation Handbook) JimN
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Today's Featured Article - Product Review: Storm Covers - by Staff. We recently had a chance to try out the new Storm Cover for the Ford 9N, 2N and 8N tractor that is now being re-introduced to a new generation of Ford N-Series tractor owners. Originally produced more than 40 years ago, it is now enjoying a reproduction run that has been licensed by the Ford Motor Company. An original storm cover was used for the pattern, and this reproduction cover is indeed exactly as the original (of which we had previously only seen pictures of in miscellaneous old sale
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