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Air pressure is the force exerted on an object or area by the weight of surrounding air particles.

en.wikipedia.org/wiki/Atmospheric_pressure

Atmospheric pressure, sometimes also called barometric pressure, is the pressure within the atmosphere of Earth In most circumstances atmospheric pressure is ...

www.srh.noaa.gov/jetstream/atmos/pressure.html

Air pressure can be increased (or decreased) one of two ways. First, simply adding molecules to any particular container will increase the pressure. A larger  ...

www.britannica.com/science/atmospheric-pressure

Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified ...

extension.illinois.edu/treehouse/airpressure.cfm?Slide=1

We don't think about it, but we are actually living at the bottom of a large pool of air. This large pool of air is called the atmosphere. It is made up of mostly ...

ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/prs/def.rxml

Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface. In the diagram below, the ...

scied.ucar.edu/webweather/weather-ingredients/pressure

Air molecules constantly bounce off each other and everything else around them. The force exerted by these air molecules is called air pressure. Where air ...

www.ask.com/youtube?q=Air+Pressure&v=jmQ8FWnM0fA
Jun 1, 2011 ... so why is it when air rises the air pressure gets lower? Not trying to be a smartass I don't understand this or why things happen the way they do.

www.nationalgeographic.org/encyclopedia/atmospheric-pressure

May 14, 2011 ... The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.

www.nasa.gov/audience/foreducators/topnav/materials/listbytype/What_is_Atmospheric_Pressure.html

This NASA video segment explores atmospheric pressure and why humans must wear specialized suits in space. Viewers learn that atmospheric pressure is the ...