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    Superpressure balloon

    A superpressure balloon is style of balloon where the pressure of lifting gas changes as the balloon temperature changes due to the heating and cooling of the diurnal cycle. This is an alternative to the more common approach of allowing the gas volume to change in response to diurnal heating and cooling. However, a change in gas volume will necessarily produce a change in the buoyancy of the aircraft which will necessarily lead to a change in altitude.

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