bplist00Ñ_WebMainResourceÕ _WebResourceMIMEType_WebResourceData_WebResourceTextEncodingName_WebResourceFrameName^WebResourceURLYtext/htmlO gSection 3, ch 15   Air Pressure

Section 3, ch 15   Air Pressure 

Properties of Air  Density = mass/volume 

The more molecules per volume, the greater the density 

Pressure = force/area 

Denser air exerts more pressure than less dense air. 

Air Pressure   The result of a column of air pushing down on you.  

Air pushes in all directions. 

Air pressure can be measured using a barometer. 

Hg barometer measures air pressure on a column of Hg. 

Aneroid barometer is more portable and usable. Its metal    

    outer chamber is sensitive to pressure changes and exerts

force on springs and levers which determine air pressure. 

Units of measurement include mm Hg and millibars.

1 inch = 33.87 millibars.  760mm Hg is standard pressure. 

Affect of Altitude on  Air pressure decreases as altitude increases.

air pressure   As air pressure decreases, density decreases.

Density decreases as altitude increases.

Less dense air means less O2 each cubic meter of air than at

sea level.  

 

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