Balloons now are used to move huge trees from their cutting place on mountain
slopes to conventional transportation.
Calculate the volume of a balloon needed if it is desired to have a lifting
force of 1000 kg when the temperature is 290 K at 0.940 atm.
The balloon is to be filled with helium.Assume that air 80 mol % N2 and
20 mol % O2.Ignore the mass of the superstructure and propulsion engines of
the balloon.
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