Hot air balloons work thanks to convection currents. The heat source under the globe heats the air inside. A convection current inside the balloon keeps hot air as the heated air increases, cools and decreases to be heated again.
The warm air inside the globe is less dense than the coldest air outside, causing the air balloon to rise up.
Speaking a hot air balloon in warm weather is much more difficult than in cold weather, since the air inside the globe should be heated more in a hot day to be less dense than the external air. If temperatures become too high, the balloon coating can be damaged.
The image below shows the convection current inside the globe that heats the air.
Last update on September 6, 2023 by Emma Vanstone
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