What Is Atmospheric Pressure? Definition, Causes, and Effects Explained

What Is Atmospheric Pressure?

Atmospheric pressure, often referred to as air pressure, is the force exerted by the weight of air in the Earth’s atmosphere. It plays a vital role in weather patterns, human health, and various scientific applications.

Causes of Atmospheric Pressure

This pressure results from gravity pulling air molecules toward the Earth’s surface. Factors like altitude, temperature, and humidity influence its intensity, with higher altitudes experiencing lower pressure.

Key Effects on Weather and Health

Changes in atmospheric pressure drive weather systems, causing winds, storms, and precipitation. It also affects human bodies—shifts can lead to ear discomfort or altitude sickness during travel.

Frequently Asked Questions

How is atmospheric pressure measured?
It is commonly measured using a barometer, with units like Pascals (Pa) or inches of mercury (inHg).

Why does pressure decrease with altitude?
As altitude increases, air density and molecular weight decrease, reducing pressure.

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