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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 closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying ...

Jun 1, 2011 ... why is it when the air pressure is low, the weather is bad????﻿. Read more. Show less. Reply 2 3. Loading... View all 3 replies. View all 3 replies. Hide replies. Jared Graber2 years ago. Why the air in the upper-atmosphere stay so cold yet is expanded like hot air still? I didn't see this go over in the video.﻿.

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.livescience.com/39315-atmospheric-pressure.html

Aug 29, 2013 ... Atmospheric pressure is the force exerted against a surface by the weight of the air above the surface.

usatoday30.usatoday.com/weather/wbarocx.htm

www.kidsgeo.com/geography-for-kids/0049-atmospheric-pressure.php

To understand pressure, consider a sponge. When left alone, a sponge stretches out to its full size. As you squeeze down on the sponge, what happens? How small can you make it? Can you hide the sponge entirely within your hand? When the sponge is squished up as tightly as you can make it, how does it feel?

www.artofmanliness.com/2015/07/07/fair-or-foul-how-to-use-a-barometer

Jul 7, 2015 ... Atmospheric pressure — or barometric pressure — is simply the weight of the air at ground level. It's a little easier to understand when you think about the concept of water pressure first. As you get deeper in water, the pressure increases. This is because as you descend, the built up weight of the water on ...