What is Atmospheric Pressure? Definition, Causes & Effects

Atmospheric pressure is the force exerted by the weight of air above any point on Earth’s surface. It plays a vital role in weather patterns, human health, and scientific applications.

Understanding Atmospheric Pressure Definition

To grasp the atmospheric pressure definition, imagine a column of air extending from the ground to space. This air has mass and weight, pressing down on surfaces. Measured in units like Pascals (Pa) or atmospheres (atm), standard sea-level pressure is 101,325 Pa.

Causes of Atmospheric Pressure

Gravity pulls air molecules toward Earth, creating pressure. Variations occur due to altitude, temperature, and humidity. Higher altitudes have lower pressure because there’s less air above.

Effects on Weather and Health

Changes in atmospheric pressure influence weather systems, leading to storms or clear skies. It also affects human bodies, potentially causing ear discomfort or altitude sickness.

FAQ Section

How is atmospheric pressure measured?
It is commonly measured using a barometer, with mercury or aneroid models.

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

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