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These values can change from one day to another in terms of the meteorological  conditions.
There are days of high pressure (anticyclone) and others of low pressure (squall).

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This pressure descends with height because the air column that presses is smaller when ascending

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The value of atmosphere preassure (P atm).
the sea level, is used as a unit of preassure just like mercury.

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Factors of variation of atmospheric pressure

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Factors of variation of atmospheric pressure

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Altitude: When a body is at a higher altitude, pressure decreases and when is at a lower altitude it increases.
Temperature: Hot air is less dense than cold air so pressure can vary in the same geographic place according to changes in temperature.
Humidity: Places with more humidity have less pressure and places with less humidity the pressure is higher.