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? 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.

Air Pressure is . the force that air molecules push down on a surface. Hey!! Get away from me! AIR AIR It’s all around us. . . Like it or not… AIR AIR AIR

Air Pressure is . . .

Air Pressure. . . . is not the same everywhere on earth.

3 Things that affect Air Pressure are Humidity Altitude Temperature

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

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

Temperature Affects Air Pressure

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)

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

In Low Air Pressure, the air molecules are moving and are apart. fast far

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

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?

Can Crushing Experiment

Air pressure Air pressure Air pressure decreases decreases decreases As temperature increases . . As altitude increases . . As humidity increases . . Air pressure Air pressure Air pressure decreases decreases decreases

Low Air Pressure L Low air pressure brings . PRECIPITATION

H skies High Air Pressure fair High air pressure brings clear and weather. fair

High and Low Pressure

A is used to measure air barometer

Air Masses and Pressure

Air Pressure Review precipitation clear decreases decreases decreases 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. clear decreases decreases decreases slow close together fast far apart barometer