# What is Atmospheric Pressure? Definition, Formula, and Examples
**Atmospheric pressure** is the force exerted by the weight of the air above us. It affects weather patterns, human health, and even how we cook! Understanding this concept is essential in fields like meteorology, aviation, and engineering.
## **Definition and Basics**
The standard **atmospheric pressure definition** refers to the pressure at sea level, approximately 1013.25 millibars or 101.325 kPa. This pressure decreases with altitude, which is why it’s harder to breathe on mountaintops.
## **Formula and Calculation**
The formula for atmospheric pressure is ( P = rho g h ), where ( rho ) is air density, ( g ) is gravity, and ( h ) is height. This helps scientists model weather changes and predict storms.
### **Real-World Examples**
Weather maps use isobars to show pressure differences. Low pressure often brings rain, while high pressure indicates clear skies. Altimeters in aircraft rely on pressure readings to determine elevation.
## **FAQs**
**What causes atmospheric pressure?**
Keyword: atmospheric pressure definition
It’s caused by the weight of air molecules pressing down on the Earth’s surface.
**How is it measured?**
Barometers are the primary tools, using units like Pascals (Pa) or inches of mercury (inHg).
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