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Notes on Air Pressure

Pages 10-14 Weather textbook

 

Air has mass therefore it also has:

 

Air Pressure: The weight of a column of air pressing down on an area of Earth.

 

Barometer: An instrument that measures air pressure.

 

Altitude and its effect on air pressure and density:

·        Air pressure decreases as altitude increases – The higher up you go the less air is pushing down on you.

·        As Air pressure decreases, density decreases.  The higher up you go the less dense the air is – The molecules of air are further apart.  This means that the amount of oxygen in a given space is less, so you would have trouble breathing.