The mercury in barometer on mountains is often lower than air sea level because pressure on Earth changes with the altitude of the surface. From the surface of the Earth to the mesosphere's top, pressure varies gradually.
The weight of the atmosphere (the air around you) and the weight of a mercury column are "balanced" by a barometer, which operates like a balance. The mercury will rise if the air pressure is high. The mercury drops when the air pressure is low.High pressure, which meteorologists interpret as pleasant weather, is frequently indicated by a high barometer reading. A low barometer reading is frequently an indicator of inclement weather.
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