# 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.

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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