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Section 3, ch 15Â Â Air Pressure
Section 3, ch 15Â Â
Air PressureÂ
Properties of Air  Density =
mass/volumeÂ
The
more molecules per volume, the greater the densityÂ
Pressure
= force/areaÂ
Denser
air exerts more pressure than less dense air.Â
Air Pressure   The result of a
column of air pushing down on you. Â
Air
pushes in all directions.Â
Air
pressure can be measured using a barometer.Â
Hg
barometer measures air pressure on a column of Hg.Â
Aneroid
barometer is more portable and usable. Its metal   Â
    outer chamber is sensitive
to pressure changes and exerts
force
on springs and levers which determine air pressure.Â
Units
of measurement include mm Hg and millibars.
1
inch = 33.87 millibars. 760mm Hg is standard pressure.Â
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. Â
Â
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