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Pressure can tell you altitude (both up in mountains or down in caves). This is the basis for how many altimeters work. It helps if you know the pressure at a nearby known altitude. This helps...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:23Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/15412 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/