ballonet

From Glossary of Meteorology
A gastight compartment of variable volume to control ascent and descent and to maintain pressure in a nonrigid airship.

When the ballonet is used within a superpressure balloon, valving of gas increases altitude, and pumping of air into the ballonet causes the balloon to descend. The superpressure is only marginally affected as the balloon changes altitude.


  1. A measure (or condition) of height, especially of great height, as a mountain top or aircraft flight level.
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