Air Pressure CH 15 Prentice Hall p.509-514 CH 15 Prentice Hall p.509-514 At 15 15. 3ppt.
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Transcript of Air Pressure CH 15 Prentice Hall p.509-514 CH 15 Prentice Hall p.509-514 At 15 15. 3ppt.
![Page 1: Air Pressure CH 15 Prentice Hall p.509-514 CH 15 Prentice Hall p.509-514 At 15 15. 3ppt.](https://reader033.fdocuments.us/reader033/viewer/2022042822/56649e6a5503460f94b67580/html5/thumbnails/1.jpg)
Air PressureAir PressureCH 15 Prentice Hall
p.509-514CH 15 Prentice Hall
p.509-514
At15
15. 3ppt
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• Problem:– Does Air Have Mass?
• Hypothesis:– Air has mass.– Air doesn't have mass.
• Materials:– Stopwatch Graduated cylinder balance
beaker metric ruler
Air Lab
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Air Lab
• Procedure: – Write a Step by Step Procedure– Start with a verb.
• Data/Obs: (Record Obs)
• Conclusion:– Identify the Problem, Hypothesis, explain if data
supported it or not.
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Balloon In Jar
• Problem: What are ways the balloon can be inflated in the jar?
• Hypothesis:– Blowing in tube B will inflate
the balloon.– Pulling air out of tube A will
inflate the balloon.
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Balloon In Jar (Observations)
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Demonstrations
Empty Water Bottle
Shaving Cream
Peeps
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Empty Water Bottle
• Problem: – What will happen to the water
bottle in the vacuum?
• Hypothesis:
• Observations: – The water bottle expanded.
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Peep Show
• Problem: What will happen to the peeps in the vacuum?
• Hypothesis:
• Observations: – The peeps grew larger.
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Shaving Cream
• Problem: – What will happen to the shaving cream in
the vacuum?
• Hypothesis:
• Observations: – The shaving cream grew and expanded
upward.
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• Air has the following Properties:
Properties of Air
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Air Molecule Model
• Gases consist of molecules which have: – mass and occupy a volume.
• Therefore: they have density.
• These molecules move randomly and bump into each other.
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• The amount of mass in a given volume of air.
• Density=mass/volume
Density
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Air Molecule ModelCalculate the density in each box.
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Calculate the density for each side.Draw a line to show where the wall should move?
Air Molecule Model Situation 1
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Air Molecule Model Situation 1
• The density is greater on the left, therefore pressure is higher.
• There are more molecules on the left side and there will be more molecules striking the wall.– As a result, the wall will move to the right.
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Calculate the density for each side.Draw a line to show where the wall will move?
Air Molecule Model Situation 2
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• The density of air is higher on the right, therefore the pressure is greater.
• The molecules on the right side will hit the wall more frequently, – therefore the wall will move to the left.
Air Molecule Model Situation 2
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• The force on an area or surface.• More mass in a given volume = a higher
density. As a result pressure will be greater.
Pressure
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• The result of the weight of a column of air pushing down on an area.
(Air) Pressure• The weight of a column of air above the desk = the weight of a large school bus.
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Desk Vs Air Pressure
• Why isn’t the desk crushed?– Molecules of air push in all directions.– The pressure is balanced by the air pushing up on
the desk.
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Balloon In Jar (Explanation)
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Balloon In Jar
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• Problem:– What will happen when the egg
is placed on the bottle once the paper is lit?
• Hypothesis:– The egg will be pushed into or
pushed off the bottle.
• Observations: – The egg gets pushed into the
bottle.
Egg Demonstration
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• Problem: How will placing a drinking glass over lit candles sitting in a pie pan filled with water affect the water in the pan?
• Hypothesis
1,2,3 Candle
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1,2,3 Candle Diagram
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• Problem:– What will happen to the heated
can when the opening is sealed with water.
• Hypothesis:– The can will….
• Observations:– The can is crushed.
Soda Can
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Speed of Molecules & Temp
• What happens to the speed of the molecules when temperature is increased?
• What happens to the amount of times the walls are hit?
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Speed of Molecules & Temp
• What happens to the speed of the molecules when temperature is increased?
• What happens to the amount of times the walls are hit?
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Speed of Molecules & Temp
• What happens to the speed of the molecules when temperature is increased?
• What happens to the amount of times the walls are hit?
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Speed of Molecules & Temp
• What happens to the speed of the molecules when temperature is increased?
• What happens to the amount of times the walls are hit?
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• Is the total energy of motion in the molecules of a substance. • Gases are made of molecules that are
constantly moving. The faster they are moving the more energy they have.
Fast
More EnergySlow
Less Energy
Thermal Energy
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• The average amount of energy of motion in the molecules of a substance.
• It is a measure of how hot or cold something is.
Temperature
More EnergyWarmer
Less EnergyCooler
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• Thermometer- An instrument used to measure the temperature, consisting of a thin, glass tube with a bulb on one end that contains a liquid, usually mercury or alcohol.– Liquids expand when heated or contract
when cooled.– It is measured in degrees Celsius or
Fahrenheit.• Freezing 0°C = 32°F• Boiling 100°C = 212°F
Measuring Temperature
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Temperature and Volume
• What happens to the volume of a gas when it is heated?
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Temperature and Volume
• What happens to the volume of a gas when it is heated?
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Temperature and Volume
• What happens to the volume of a gas when it is heated?
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Temperature and Volume
• What happens to the volume of a gas when it is heated?
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• Heating air molecules increases their energy making them move faster.
• As a result, they will hit the wall more often, moving the wall to the right.– Lowers the pressure on the warmer side– Increases pressure on the cooler side.
Air Molecule Model Situation 3
FasterMolecules
SlowerMolecules
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• Cooling air molecules decreases their energy making them move slower.
• As a result, they will hit the wall less often, moving the wall back to the left.– Pressure on the right side is higher, pushes back towards
the left side which has a lower pressure.
Air Molecule Model Situation 4
FasterMolecules
SlowerMolecules
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1,2,3 Candle Diagram
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1,2,3 Candle Diagram
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• Diagram Explanation:
• Written Explanation:
Egg Demonstration
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• Diagram Explanation:
• Written Explanation:
Can Demonstration
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• A barometer is used to measure air pressure.– Mercury Barometers– Aneroid Barometers
Measuring Air Pressure
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• The first barometers.
• Pressure pushes on the surface of the mercury.
• When pressure increases the mercury rises up the tube.
• When pressure decreases the mercury falls in the tube.
Mercury Barometer
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• Which barometer shows a higher pressure?
• Which barometer shows a lower pressure?
Feeling the Pressure
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• “without liquid”
• Uses an air tight metal chamber.
• The chamber is sensitive to changes in air pressure.
Aneroid Barometer
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• Weather Reports use inches of mercury.
• National Weather Service Maps use millibars.
• 1 inHg = 33.87 millibars
Units of Air Pressure
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Air Pressure and Density
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• Altitude – elevation• Air pressure is the
weight of a column of air pushing down on an area.
• Where is the pressure greater/less?
Altitude Affects Pressure
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• Less weight at the top- so there is lower air pressure.
• Sea-level has the weight of the whole atmosphere on it.- Pressure is greatest here.
Altitude Affects Pressure
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• As you increase in altitude, the density of air decreases.
• Air pressure decreases as altitude increases.
• As air pressure decreases so does density.
Altitude Affects Density
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• As you go up, there are fewer molecules.
• However: The percent of a gas in the atmosphere always stays the same at any altitude.– 78% Nitrogen– 21% Oxygen
Altitude Affects Density
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Isobar Maps
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• Lines connect areas of __________pressure.
Rules for Drawing Isobars
• Set an interval that is appropriate for the change in pressure.
• Make sure all points on one side of a line are higher and lower on the other.
Sunny(Happy)Weather
Cloudy(Lousy)
Weather
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Practice Drawing Isobars
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. 1004
. 1002
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. 1005
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. 1003
. 1007
. 1004
. 1005
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.998
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.1000.1000
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Practice Drawing Isobars
Draw Isobars on the diagram below. Mark the center of low pressure and high pressure with an H and L.
Interval = ___________________
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Drawing Isobars
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• Isobars connect lines of equal pressure.
Isobar Maps on RHW
Sunny(Happy)Weather
Cloudy(Lousy)
Weather