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

What is Atmospheric Pressure?

Atmospheric pressure is the force exerted by the weight of air molecules in Earth’s atmosphere. It plays a crucial role in weather patterns, human health, and scientific measurements.

Definition and Basics

To define atmospheric pressure, it is the pressure at any point on Earth’s surface caused by the air above it. Measured in units like Pascals (Pa) or atmospheres (atm), it decreases with altitude.

Causes of Atmospheric Pressure

Gravity pulls air molecules toward Earth, creating pressure. Temperature and humidity variations also influence it, leading to changes in weather systems.

Effects on Weather and Health

Low pressure often brings storms, while high pressure indicates clear skies. Changes can affect breathing and cause discomfort in sensitive individuals.

Frequently Asked Questions

How is atmospheric pressure measured?
It is commonly measured with a barometer, providing data for forecasts.

Why does pressure change with altitude?
Higher altitudes have fewer air molecules, resulting in lower pressure.

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