What is Atmospheric Pressure? Definition, Formula & Examples

Atmospheric pressure is the force exerted by the weight of air above a given point on Earth’s surface. It is a crucial concept in physics and meteorology, influencing weather patterns, aviation, and even human health.

Understanding Atmospheric Pressure Definition

The standard atmospheric pressure definition refers to the pressure at sea level, approximately 1013.25 hPa. It decreases with altitude due to thinner air layers.

Key Formula and Calculations

The barometric formula, P = P₀ × e^(-h/H), calculates pressure at height h, where P₀ is sea-level pressure and H is scale height.

Real-World Examples

Weather systems use high/low pressure areas; scuba divers monitor pressure to avoid decompression sickness.

FAQs

How is atmospheric pressure measured?

It is measured using barometers, with common units like Pascals (Pa) or inches of mercury (inHg).

Why does pressure affect weather?

High pressure often brings clear skies, while low pressure indicates storms or precipitation.

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