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Air Pressure. By Mrs. S. Deringer. Air Has Mass. I knew I shouldn’t have eaten all that air. AIR. AIR. What is in the Air?

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Presentation Transcript
slide1

Air Pressure

By Mrs. S. Deringer

slide2

Air Has Mass

I knew I shouldn’t have eaten all that air.

AIR

AIR

slide3

What is in the Air?

People generally believe that air is composed 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.

air pressure is
Air Pressure is .

the force that air molecules push down on a surface.

AIR

AIR

AIR

Hey!!

Get away from me!

AIR

AIR

It’s all around us. . . Like it or not…

AIR

AIR

AIR

air pressure
Air Pressure. . . .

is not the same everywhere on earth.

3 things that affect air pressure are
3 Things that affect Air Pressure are

Humidity

Altitude

Temperature

slide9

Temperature

Air pressures decreases

whenever,

or

increases.

Humidity

Altitude

temperature affects air pressure
Temperature Affects Air Pressure

lower

Warmer air brings ______ air pressure.

slide12

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 doesn’t feel any weight (less pressure)

slide13

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

slide14

fast

In Low Air Pressure, the air molecules are moving

and are apart.

far

slide15

slow

close together

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

could air crush a metal tank car
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?

slide17

As temperature increases . .

As altitude increases . .

As humidity increases . .

Air pressure

Air pressure

Air pressure

decreases

decreases

decreases

low air pressure
Low Air Pressure

L

Low air pressure brings .

PRECIPITATION

high air pressure
High Air Pressure

H

High air pressure brings clear and weather.

skies

fair

air pressure review
Air Pressure Review

precipitation

clear

  • A low pressure system brings ___________ weather.
  • A high pressure system brings __________ weather.
  • As the humidity or amount of moisture in the air increases the air pressure _________.
  • As the air temperature gets warmer the air pressure ___________.
  • The higher up you go air pressure ___________.
  • In high air pressure the air molecules are moving __________ and are _________________.
  • In low air pressure the air molecules are moving __________ and are ______________________.
  • A ____________________ measures air pressure.

decreases

decreases

decreases

slow

close together

fast

far apart

barometer