new area of focus: air pressure, the factor that controls the weather. new area of focus: air...
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Class Demo: Does air have weight? –How could we measure the weight of air? Copyright © 2010 Ryan P. MurphyTRANSCRIPT
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New Area of Focus: Air Pressure, The New Area of Focus: Air Pressure, The factor that controls the weather.factor that controls the weather.
Copyright © 2010 Ryan P. Murphy
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• Class Demo: Does air have weight?– How could we measure the weight of air?
Copyright © 2010 Ryan P. Murphy
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• Air is made of matter. Matter has mass and takes up space.
Copyright © 2010 Ryan P. Murphy
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“Ouch!” “Air molecules are everywhere.”
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• Activity / Demonstration: Balloon in a bottle.– Fit a balloon around the edges of a bottle and
push it inside. – Try and blow up the balloon. What happens?– Use a pin to poke a hole in the bottom and try
again.– Practice covering the hole and releasing.
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• Activity / Demonstration: Balloon in a bottle.– Fit a balloon around the edges of a bottle and
push it inside. – Try and blow up the balloon. What happened?– Teacher to use a nail and hammer to poke a hole
in the bottom and try again. (Eye protection)– Practice blowing up the balloon and then
plugging with your finger when inflated.
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Air Pressure: The pressure caused Air Pressure: The pressure caused by the weight of the atmosphere. by the weight of the atmosphere.
Copyright © 2010 Ryan P. Murphy
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Air Pressure: The pressure caused by Air Pressure: The pressure caused by the weight of the atmosphere. the weight of the atmosphere.
Copyright © 2010 Ryan P. Murphy
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Air pressure applies a force equal in Air pressure applies a force equal in all directions.all directions.
Copyright © 2010 Ryan P. Murphy
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Air pressure applies a force equal in Air pressure applies a force equal in all directions.all directions.
Copyright © 2010 Ryan P. Murphy
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As elevation increases, air pressure As elevation increases, air pressure decreases.decreases.
Copyright © 2010 Ryan P. Murphy
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As elevation increases, air pressure As elevation increases, air pressure decreases.decreases.
Copyright © 2010 Ryan P. Murphy
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As elevation increases, air pressure As elevation increases, air pressure decreases.decreases.
Copyright © 2010 Ryan P. Murphy
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As elevation increases, air pressure As elevation increases, air pressure decreases.decreases.
Copyright © 2010 Ryan P. Murphy
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• Mt. Everest – Death Zone past camp IV because there are very few air molecules.
Copyright © 2010 Ryan P. Murphy
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• Mt. Everest – Death Zone past camp IV because there are very few air molecules.– Including oxygen
Copyright © 2010 Ryan P. Murphy
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As you increase in elevationAs you increase in elevation
Copyright © 2010 Ryan P. Murphy
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As you increase in elevationAs you increase in elevation
Copyright © 2010 Ryan P. Murphy
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As you increase in elevation As you increase in elevation
Copyright © 2010 Ryan P. Murphy
Low Pressure
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As you increase in elevation As you increase in elevation air air pressure decreases. pressure decreases.
Copyright © 2010 Ryan P. Murphy
Low Pressure
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As you increase in elevation air As you increase in elevation air pressure decreases. pressure decreases. As you As you decrease in elevation decrease in elevation
Copyright © 2010 Ryan P. Murphy
Low Pressure
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As you increase in elevation air As you increase in elevation air pressure decreases. As you pressure decreases. As you decrease in elevation decrease in elevation
Copyright © 2010 Ryan P. Murphy
Low Pressure
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As you increase in elevation air As you increase in elevation air pressure decreases. As you pressure decreases. As you decrease in elevation decrease in elevation
Copyright © 2010 Ryan P. Murphy
Low Pressure
High Pressure
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As you increase in elevation air As you increase in elevation air pressure decreases. As you pressure decreases. As you decrease in elevation decrease in elevation pressure pressure increases. increases.
Copyright © 2010 Ryan P. Murphy
Low Pressure
High Pressure
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• As you increase in elevation…– air pressure decreases.
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• As you increase in elevation…– Air pressure decreases.
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Low Pressure
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Low Pressure
Higher Pressure
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• Water is heavy and can create enormous pressures as you go down in depth.
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Barometer: Instrument that Barometer: Instrument that measures air pressure.measures air pressure.
Copyright © 2010 Ryan P. Murphy
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• Standard sea-level pressure is 14.7 lb per sq in. (1,030 grams per sq cm), which is equivalent to a column of mercury 29.92 in. (760 mm) in height;
• The decrease with elevation is approximately 1 in. (2.5 cm) for every 900 ft (270 m) of ascent.
Copyright © 2010 Ryan P. Murphy
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• Standard sea-level pressure is 14.7 lb per sq in. (1,030 grams per sq cm), which is equivalent to a column of mercury 29.92 in. (760 mm) in height;
• The decrease with elevation is approximately 1 in. (2.5 cm) for every 900 ft (270 m) of ascent.
Copyright © 2010 Ryan P. Murphy
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AA rising barometer = Increasing air pressure.rising barometer = Increasing air pressure.
This usually means…This usually means…
Copyright © 2010 Ryan P. Murphy
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• High pressure = Good Weather
Copyright © 2010 Ryan P. Murphy
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• Low Pressure = Poor weather coming
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• Low Pressure = Poor weather coming
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
Everest
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
Everest
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-Level
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-Level
Jet Plane
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-Level
Jet Plane
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-LevelBottom
of a Pool
Jet Plane
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-LevelBottom
of a Pool
Jet Plane
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• Word Bank: Titanic wreck, Top of Mt. Everest, sea-level, jet plane, bottom of your pool, hot air balloon.
High Pressure Low Pressure
Copyright © 2010 Ryan P. Murphy
TitanicWreck
Top of Mt.
EverestSea-LevelBottom
of a Pool
Jet PlaneHot Air Balloon
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• Activity! Marshmallow torture
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• Activity! Marshmallow torture– Place Marshmallow into Bell Jar vacuum.– Remove Air from Bell Jar– Record Picture of Marshmallow.– Quickly let air rush back in and observe.
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• Activity! Marshmallow torture– Place Marshmallow into Bell Jar vacuum.– Remove Air from Bell Jar– Record Picture of Marshmallow.– Quickly let air rush back in and observe.
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• Activity! Marshmallow torture– Place Marshmallow into Bell Jar vacuum.– Remove Air from Bell Jar– Record Picture of Marshmallow.– Quickly let air rush back in and observe.
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• Activity! Marshmallow torture– Place Marshmallow into Bell Jar vacuum.– Remove Air from Bell Jar– Record Picture of Marshmallow.– Quickly let air rush back in and observe.