A convection current is a current as the hot air rises and cold air sinks. This only occurs in liquids and gasses.
Hot air balloons
Hot air balloon
In a hot air balloon the fire is released into the balloon and the balloon rises.
Why?
Convection current happens in a hot air balloon to make it fly. As the hot air rises the balloon flies, but is stop blowing the heat in to the balloon then it will lower.
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