7. As the balloon is flying straight up, keep track of the time of flight
with the stopwatch. Measure the time from when you let it go until
it touches the floor. Record your data on this chart to see how
things change.
Source: Science Buddies Staff. (2017, November 6).
Up, Up, and Away in Your Own Hot-air Balloon!
Retrieved from www.sciencebuddies.org/science-fair-projects/project-ideas/Aero_p041/
aerodynamics-hydrodynamics/make-a-hot-air-balloon#procedure
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