What Is Air Pressure? Definition, Examples, and Facts
Air pressure is a fundamental concept in physics and meteorology, affecting our daily lives in ways we often overlook. In simple terms, air pressure definition refers to the force exerted by the weight of air molecules in the atmosphere. This invisible force plays a crucial role in weather patterns, aviation, and even human health.
Understanding Air Pressure
Air pressure results from air molecules colliding with surfaces. The greater the number of molecules in a given area, the higher the pressure. At sea level, standard air pressure is approximately 101.3 kilopascals (kPa).
Real-World Examples of Air Pressure
Common examples include inflating tires, using straws to drink, and weather changes like storms or clear skies. Low pressure often brings clouds and rain, while high pressure indicates fair weather.
Frequently Asked Questions
How is air pressure measured?
It is typically measured with a barometer in units like atmospheres (atm) or Pascals (Pa).
Why does air pressure decrease with altitude?
As altitude increases, air molecules become less dense, reducing pressure.
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