Self-inflating or operating by means of air pressure generated within itself, often used in mechanical or pneumatic systems.
From auto- (self) + pneumatic (relating to air or gas). The term emerged in engineering contexts in the 19th-20th centuries to describe systems that use internally-generated air pressure for operation.
Autopneumatic technology powers countless everyday devices—from automatic door openers to air brakes in trucks—all working silently because they're smart enough to pressurize themselves without external help.
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