iPhones made in 2014+ have a barometer for real-time elevation tracking. A barometer measures air pressure, which is crucial for calculating altitude changes. The native iPhone Compass app has a ...

The wireless sensor provides accurate outdoor readings up to 330 feet away, while the color display shows comprehensive weather information including barometric pressure trends and forecast icons.

Pioneering scientists discovered atmospheric pressure (also known as barometric or air pressure) in the 17th century, and determined a startling new fact—that air actually has weight.