How it works
Although a blimp can be steered and thus qualifies as a dirigible, that term is more commonly used with rigid airships.
Blimps keep their shape with internal overpressure, typically the only solid parts are the passenger car (gondola) and the tail fins.
A non-rigid-airship that uses heated air instead of a light gas (such as Helium) as a lifting medium is called a hot air airship.
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