Barometric Pressure Device News Today

Barometric pressure device, which simply put, its like a balloon. as you go up in altitude, the balloon gets bigger. the balloon expands and makes contact at a certain altitude. thats one way to do it. those arent used commonly anymore. those are about remote devices or controls or a phone that communicates to the device. so the other way to do this is the timer. timers arent historically havent been used often because its hard to judge when the airplane is going to be at its most critical fligh...