A small auxiliary balloon inside an airship used to maintain pressure and trim the aircraft.
From French 'ballonet' (small balloon), diminutive of 'ballon.' Developed as airship technology advanced in the late 19th and early 20th centuries.
Ballonets are genius engineering—while the main balloon floats you in the air, tiny ballonets inside inflate and deflate to keep the whole airship balanced and stable.
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