I don’t know about you, but when people talk about the air pressure being high, or the air pressure being low, I get confused as to what that means.

Which type of air pressure means it will be a great sunny day or a cold rainy day?  That is what we will explore.

What is Air Pressure?

First, what is air pressure?  Pressure is the force that is put on something.  Air is all around us.  So, air pressure is the force the air pushes on everything.

Heatwave

What kind of air pressure is happening when we have a hot day?  Well, putting a lot of pressure on something causes heat.

So that would be high air pressure.  Have you ever been outside on a hot day?  Everything feels like it takes much more effort to do.  That is because you are having to work twice as hard to get through the molecules of air.  The pressure is higher meaning it is pressing the molecules closer together.

Rainfall

What kind of air pressure causes precipitation?  Of course, it is going to be the opposite, low air pressure.  But why does low air pressure cause this?  Low pressure makes it so that there is so much more room for things to expand.  So, it makes it so the air molecules are more spread out.  When we go out in the rain, it feels like we can breathe more fully because there isn’t a lot of pressure.  There is space.

With cooler weather, there is moisture in the air.  If too much pressure is causing less room, then there isn’t room for the moisture to come together and expand.  Les pressure gives moisture the opportunity to come together to create clouds.  As clouds grow bigger they can create rain or snow.

In conclusion, high air pressure creates our hot sunny days.  Whereas, low air pressure creates the cold wet days.  Now you know.  Thanks to Jared at Funsciencedemos, here is a great experiment to do at home that teaches about air pressure.

Keep reading our blog at WeatherEgg to keep up on your internal weather junkie.

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