What is Atmospheric Pressure? Definition, Causes & Effects Explained

Atmospheric pressure, often referred to as air pressure, is the force exerted by the weight of the air above us. Understanding the atmospheric pressure definition is key to grasping weather patterns, aviation science, and even human health.

Key Causes of Atmospheric Pressure

Atmospheric pressure results from gravity pulling air molecules toward Earth, creating weight. Factors like altitude, temperature, and humidity influence its variations. Higher altitudes have lower pressure due to fewer air molecules.

Effects on Weather and Environment

Changes in air pressure drive weather systems. Low pressure often brings clouds and precipitation, while high pressure indicates clear skies. It also affects ocean currents and animal behavior.

Impact on Human Health

Sudden pressure drops can cause headaches or joint pain in sensitive individuals. Pilots and divers monitor pressure to avoid altitude sickness or decompression issues.

Frequently Asked Questions

How is atmospheric pressure measured?
It is measured using a barometer, in units like hectopascals (hPa) or inches of mercury (inHg).

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

Can humans feel changes in atmospheric pressure?
Yes, rapid changes can cause physical discomfort, especially in ears or sinuses.

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