What is Atmospheric Pressure? Definition, Causes, and Effects Explained
What is Atmospheric Pressure? Definition, Causes, and Effects Explained
Atmospheric pressure is the force exerted by the weight of air in Earth’s atmosphere. It plays a crucial role in weather patterns, human health, and scientific measurements.
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. It’s measured in units like Pascals (Pa) or atmospheres (atm).
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 pressure influence weather systems, causing winds and storms. Low pressure often brings rain, while high pressure indicates clear skies. Humans may experience ear discomfort or altitude sickness with rapid pressure changes.
Frequently Asked Questions
How is atmospheric pressure measured?
It’s commonly measured with a barometer, providing readings in hPa or inches of mercury.
Why does pressure decrease with altitude?
As you go higher, air density decreases, reducing the weight of air above.
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