Question

You have a helium balloon at 1.00 atm and 25oC. You want to make a hot-air balloon with the same volume and same lift as the helium balloon. Assume air is 79.0% nitrogen and 21.0% oxygen by volume. The “lift” of a balloon is given by the difference between the mass of air displaced by the balloon and the mass of gas inside the balloon.
a. Will the temperature in the hot- air balloon have to be higher or lower than 25oC? Explain.
b. Calculate the temperature of the air required for the hot- air balloon to provide the same lift as the helium balloon at 1.00 atm and 25oC. Assume atmospheric conditions are 1.00 atm and 25oC.


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  • CreatedMay 04, 2015
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