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    Gas flow units MSCMD, KM^3 and SM^3x10

    Take a look back, and compare the size of pipes going into the gas meter and where the gas is going to get a reality check for your two versions.... If this is a low pressure gas main going to a burner, convert the volume per unit time to the linear velocity of gas through one meter of pipe...
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    Hot-Air Zeppelins?

    This scenario was central for several SF stories on Jovian planets for upper atmospheric laboratories. Central to the use of Hydrogen is that the atmosphere is reducing so no chance of accidental combustion. The engineering for doing it in an oxidizing atmosphere is nightmarish, as holding hot...