such leakage; hydrogen and helium leak rapidly through latex balloons. However, methane is highly flammable and, like hydrogen, is not appropriate for use in passenger-carrying airships. It is also relatively dense and a potent greenhouse gas.

Combinations

It is also possible to combine some of the above solutions. A well-known example is the Rozière balloon, which combines a core of helium with an outer shell of hot air.

Gases theoretically suitable for lifting

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