6.1 Air Pressure
Channel: Dr. No Knows Weather
Date: 2020-06-11

This video is part of the book https://tophat.com/marketplace/science-&-math/earth-sciences/full-course/weather-climate-and-beyond-an-introduction-to-physical-geography-third-edition-ricardo-nogueira-erik-johanson-frederick-chambers/3477/

This video topics:
Air Pressure

Barometer

6.2 Wind

Atmospheric Movement and Air Pressure Patterns

Wind

Pressure is defined as force per unit area. In a sealed container, a gas pressure is represented by the molecules' movement colliding with a given surface. In this situation, the pressure will increase if we add more molecules to the container or increase the gas temperature. In this case, the gas molecules will vibrate faster, increasing the molecules collision within the container walls. Atmospheric pressure is the weight of a column of air from the Earth's surface up to the top of the atmosphere.  In that situation the air pressure will increase in two possible ways: The first one is if the combination of variable and constant gases change (dry air is heavier than wet air); secondly, by thermal expansion or contraction.  Air expands when heated reducing pressure at the surface. When air is cooled, it sinks into the atmosphere, increasing the pressure at the surface.