An electronic switch that activates or deactivates based on changes in atmospheric or fluid pressure.
From Greek 'baros' (pressure) + English 'switch' (a device for making/breaking electrical connections). This compound term became common in 20th-century aeronautical and marine engineering.
Aircraft use baroswitches to automatically trigger safety systems at certain altitudes—they're essentially the plane's pressure-sensing nerve endings, turning on oxygen systems or pressurization when needed.
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