Hot air balloons work on the principle that warmer air is, Ask an Expert

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Hot air balloons work on the principle that warmer air is lighter than colder air. Once the amount of lift in the balloon is greater than the force of gravity holding it down, it launches. Answer the following questions:

a. Why do balloons typically launch and fly in the morning?

b. Since hot air balloons float in the atmosphere, what is their "steering mechanism?"

c. What type of "lifting" is this an example?

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