What is Atmospheric Pressure? Definition, Formula, and Examples

Atmospheric pressure is the force exerted by the weight of air in the Earth’s atmosphere. It affects weather patterns, human health, and various technologies. Understanding atmospheric pressure definition is essential for multiple scientific and practical applications.

Key Concepts of Atmospheric Pressure

Atmospheric pressure decreases with altitude and varies with weather conditions. It is measured using barometers, with common units including Pascals (Pa) and atmospheres (atm).

Formula and Calculation

The basic formula is P = ρgh, where P is pressure, ρ is air density, g is gravity, and h is height. At sea level, standard atmospheric pressure is 101,325 Pa or 1 atm.

Real-World Examples

Weather forecasting relies on pressure changes. Low pressure often indicates storms, while high pressure suggests clear skies. Altitude sickness in humans is also linked to reduced pressure at high elevations.

Frequently Asked Questions

What causes atmospheric pressure?
It results from air molecules colliding with surfaces due to gravity’s pull.

How is it measured?
Barometers, such as mercury or aneroid types, are standard tools.

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