In this episode of Aerodynamic_Poison, we uncover the inner workings—and hidden pitfalls—of one of aviation’s most deceptively simple flight instruments: the altimeter.

At first glance, it’s just a dial showing how high you are. But beneath that glass lies a delicate stack of evacuated metal wafers—an ingenious barometric system translating pressure into altitude. We’ll explore how this mechanical marvel measures your height above the earth, the role of the Kollsman window, and why a single oversight in setting barometric pressure can turn a routine flight into a terrain hazard.

From the chilling reality of “GOING FROM A HIGH TO A LOW, LOOK OUT BELOW” to the cold-weather warning “FROM HOT TO COLD, LOOK OUT BELOW,” this episode dissects the physics, standard atmosphere assumptions, and operational corrections that every pilot must master to fly safely.

Join us as we decode how the atmosphere conspires to deceive the altimeter—and how skilled aviators stay one step ahead of it.