What is Atmospheric Pressure? Definition, Causes, and Effects

What is Atmospheric Pressure?

Atmospheric pressure is the force exerted by the weight of air in the Earth’s atmosphere. It plays a crucial role in weather patterns, aviation, and even human health. Understanding define atmospheric pressure helps explain phenomena like wind, storms, and altitude effects.

Causes of Atmospheric Pressure

Atmospheric pressure results from air molecules colliding with surfaces. Gravity pulls these molecules downward, creating pressure that decreases with altitude. Factors like temperature and humidity also influence its value, measured in units such as Pascals or inches of mercury.

Effects on Weather and Health

Changes in atmospheric pressure drive weather systems; low pressure often brings storms, while high pressure indicates clear skies. It also affects human bodies—rapid shifts can cause ear discomfort or headaches, especially during flights or at high elevations.

Frequently Asked Questions

How is atmospheric pressure measured?
It is commonly measured using a barometer, with standard sea-level pressure around 1013.25 hPa.

Why does pressure decrease with altitude?
As altitude increases, air density and the weight of overhead air diminish, reducing pressure.

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