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The column of air between you and the outer edge of the atmosphere has weight and applies pressure against you. As air cools, it becomes denser, it sinks, and it will not condense (will not become liquid). What can you expect when atmospheric pressure is low?

Explanation

Low atmospheric pressure means lighter air that exerts less downward pressure on the Earth. Light air suggests that it is warming, and hence expanding and rising. Warm water vapor is more likely to condense, resulting in rain or other forms of precipitation.

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