What is Atmospheric Pressure? Definition, Causes & Effects

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

Define Atmospheric Pressure

To define atmospheric pressure, it is the pressure caused by the weight of air above a measurement point. Typically measured in units like Pascals (Pa) or atmospheres (atm), it decreases with altitude.

Key Causes of Atmospheric Pressure

Gravity and air mass are primary causes. Gravity pulls air molecules toward Earth, creating pressure. Temperature and humidity also influence variations.

Effects on Weather and Health

Changes in atmospheric pressure drive weather systems, leading to storms or clear skies. In health, it can affect breathing and cause altitude sickness.

Common Questions Answered

How is atmospheric pressure measured?
It is measured using barometers, with common units including hPa and mmHg.

Why does pressure vary with altitude?
Higher altitudes have less air above, resulting in lower pressure.

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