An important application of the aneroid barometer is the altimeter, an instrument used to measure one's distance above sea level. Atmospheric pressure is a function of altitude. The farther one is above sea level, the less the atmospheric pressure, and the closer one is to sea level, the greater the atmospheric pressure. A simple aneroid barometer can be used to confirm these differences. If the barometer is now mounted in an airplane, a balloon, or some other device that travels up and down in the atmosphere, one's height above the ground (or above sea level) can be found by noting changes in atmospheric pressure.
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David E. Newton