Air Pressure

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Air Pressure
By Mrs. S. Deringer
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Air Has Mass
I knew I shouldnt have eaten all that air.
AIR
AIR
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What is in the Air? People generally believe that
air is made mostly of oxygen. In fact, they
frequently use the terms "air" and "oxygen"
interchangeably. This is a misconception. The
content of oxygen in the air is relatively small
when compared to the gas nitrogen.
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(No Transcript)
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Air Pressure is .
the force that air molecules push down on a
surface.
AIR
AIR
AIR
Hey!! Get away from me!
AIR
AIR
Its all around us. . . Like it or not
AIR
AIR
AIR
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Air Pressure is . . .
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Air Pressure. . . .

• is not the same everywhere on earth.

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3 Things that affect Air Pressure are

• Humidity

Altitude
Temperature
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• Air pressures decreases
• whenever,
• or
• increases.

Temperature
Humidity
Altitude
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Temperature Affects Air Pressure
lower
Warmer air brings ______ air pressure.
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Temperature Affects Air Pressure
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Altitude Affects Air Pressure

• As the altitude the
• air pressure

increases
decreases
The people at the bottom of the pyramid can feel
all the weight and pressure of the people on top
(high pressure). The person on the top doesnt
feel any weight (less pressure)
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Humidity Affects Air Pressure
In addition to gases, the air also contains
moisture.

• As the humidity or moisture in the air increases
  the air pressure

decreases
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• In Low Air Pressure, the air molecules are moving
  
• and are apart.

fast
far
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• In High Air Pressure, the air molecules are
  moving and are
  .

slow
close together
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Could Air Crush a Metal Tank Car ?????

• The inside of this tank car was washed out and
  cleaned with HOT steam. Then all the outlet
  valves were shut . The tank car was sealed. All
  the workers went home for the evening. In the
  morning when they returned this is what they
  found.
• This tank car was smashed, crushed, or collapsed
  by an unseen force why?

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Can Crushing Experiment
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As temperature increases . .
As altitude increases . .
As humidity increases . .
Air pressure
Air pressure
Air pressure
decreases
decreases
decreases
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Low Air Pressure
L

• Low air pressure brings .

PRECIPITATION
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High Air Pressure
H
skies

• High air pressure brings clear
  and weather.

fair
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High and Low Pressure
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A is used to measureair
barometer
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Air Masses and Pressure