An accelerometer, a compass, a gyroscope, light sensor and proximity sensor are not surprising to be in a smartphone. But a barometer? Do Google and Samsung want people with Galaxy Nexus phones to be able to predict the weather? Or was it just there so that Google and Samsung can say: “This phone has a barometer. Beat that!”
Given manufacturers strive to maximize every space inside their devices, the latter is very unlikely. Nonetheless, someone from Google has actually tried to explain why the Galaxy Nexus has a barometer.