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 - Buying your first tractor: The People You Buy From - by Chris Pratt. If you are a first-time buyer, chances are that you are likely to take the word of the seller on things. This is where the problems start... You have reviewed your implement needs and determined the size of machine that will fit the bill and even made a list of the most desirable models. You checked on the availability of a 3-point hitch for the machines on the list and advertised in your local classified paper with so
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