Hot air balloons are a type of lighter-than-air aircraft that use heated air to create lift. The basic principle behind hot air balloons is that warm air is less dense than cooler air, allowing the balloon to rise when the air inside the envelope is heated. This concept connects to buoyancy and Archimedes' principle, as the upward force on the balloon is a result of the difference in density between the heated air inside and the cooler air outside.
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