What is Atmospheric Pressure? Definition, Formula, and Examples

Atmospheric pressure is the force exerted by the weight of air above a given point on Earth’s surface. Understanding this concept is essential for fields like meteorology, aviation, and engineering.

Atmospheric Pressure Definition and Basics

The standard atmospheric pressure definition refers to the pressure caused by the weight of the atmosphere. At sea level, it averages 1013.25 hPa or 29.92 inches of mercury.

How Atmospheric Pressure Works

Air has mass and weight, creating pressure on surfaces. Higher altitudes have lower pressure because there’s less air above.

Formula and Calculation

The barometric formula, P = P₀ ⋅ e^(-M⋅g⋅h)/(R⋅T), calculates pressure at different heights, where P₀ is sea-level pressure and h is altitude.

Real-World Examples

Weather maps use isobars to show pressure zones. Low pressure often brings storms, while high pressure indicates clear skies.

FAQs

What units measure atmospheric pressure?
Pascals (Pa), hectopascals (hPa), atmospheres (atm), or inches of mercury (inHg).

Why does pressure decrease with altitude?
There’s less air above, so less weight and force.

Explore More with Our Tools

Want to measure or learn more about pressure variations? Check out our advanced sensors and educational resources today!