Standard altitude-pressure tables allow mountaineers and ... the density of air decreases. Temperature also changes the density of air. As air gets warmer it expands and becomes less dense ...

Back home after his trip, he built this simple Temperature, Altitude and Pressure Display Device using a few off the shelf parts. Following a brief search, he zeroed in on the BMP 180 sensor ...

A barometer measures air pressure, which is crucial for calculating altitude changes. The native iPhone Compass app has a built-in feature for instant elevation data. You can't imagine some of the ...