How Does Air Pressure Change?


How does air pressure change? Information on the air pressure changes with altitude and humidity.

Air PressureHow Does Air Pressure Change?

Air pressure changes with:

a) Altitude. The density of the air decreases as the altitude increases. It was found that the air pressure falls approximately 1 cm of mercury pressure for every 110 m of ascent. This is true up to 6000 m. So the air pressure at the TöjfoTa mountain is lower than the air pressure at sea level.

If you make a rapid change in altitude your eardrums become sensitive to the resulting change in air pressure.

This unpleasent feeling can be removed by swallowing, which helps to open the eustachian tube so that the internal pressure on the eardrum becomes the same as the outer air pressure. Airplane passengers and pilots often use chewing gum to keep swallowing routinely.

b) Humidity. Water vapour is less dense than air. If there is a lot of water vapour in the air, or the weather is humid, the average density of the air decreases and its pressure decreases also.

Air pressure on a rainy or snowy day is lower than air pressure on a dry day.

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