![Page 1: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/1.jpg)
Air Pressure
• I can compare and contrast high and low pressure systems.
• I can describe that high pressure systems result in fair weather due to air sinking, and low pressure systems may result in severe weather due to air rising.
![Page 2: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/2.jpg)
Air Pressure Cornell NotesKey Words Notes
Summary:
![Page 3: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/3.jpg)
Air Pressure Activities
A.Inverted Glass
B.Stop the Leak
C.Collapsing Can
In your notebook:
1. Diagram of set-up
2. Description of results
3. Explanation/principle involved
![Page 4: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/4.jpg)
Air Pressure
![Page 5: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/5.jpg)
Air Pressure• Air Pressure is
a measure of the force of the air pressing down on the earth’s surface
![Page 6: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/6.jpg)
Air Pressure can vary at any can vary at any particular point on the Earth particular point on the Earth
depending on the density of the airdepending on the density of the air
Density = mass / volumeDensity = mass / volume
![Page 7: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/7.jpg)
Challenge:
Results and Explanation:
1. Fill a cup with water. 2. Cover the cup with an index card.
3. Invert the cup. What happened?
Does the water spill out of the cup? Explain (using concepts on pressure)
Title: Activity 1. Inverted Cup Date: Feb. 2010
Summary:
![Page 8: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/8.jpg)
Inverted CupInverted Cup
cardboard
Air Pressure
When cup is completely filled with water, no air is
left in cup, thus no air pressure. The inverted cup can therefore hold
water up because the air pressure is working
against the underside of the cup.
There is higher air pressure outside pushing There is higher air pressure outside pushing upward than the inside of cup pushing downward.upward than the inside of cup pushing downward.
![Page 9: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/9.jpg)
Challenge:
Solution:
Results and Explanation:
How can you stop the leak in this soda can?
Title: Activity 2. Stop the Leak Date: Feb. 2010
Summary:
![Page 10: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/10.jpg)
Challenge:
Solution:
Results and Explanation:
How can cause a can to collapse?
Title: Activity 3. Collapsing Can Date: Feb. 2010
Summary:
Explain the principle behind the collapsing can.
![Page 11: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/11.jpg)
Collapsing CanCollapsing Can
Before heating, the can was filled with water and air.
By boiling the water, the liquid changed into water vapor
The water vapor or steam pushed the air that was inside, out of the can.
In closing off the can, air is prevented from going back to the can.
Cooling (water in basin) condenses water vapor back to water. All the
vapor which took up space inside the can turned into a few drops of
water, which take up less space.
Pressure inside can drops allowing outside air pressure to push on the can and
crush it.
![Page 12: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/12.jpg)
Challenge:
Results and Explanation:
Who can drink the fastest?
Title: Activity 3. Straw drinking race Date: Feb. 2010
Summary:
Explain the principle behind straw drinking. When you drink liquid through a straw, is it accurate to say the liquid is sucked up the straw or pushed up the straw?
Regular straw Modified straw
![Page 13: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/13.jpg)
Straw Drinking RaceStraw Drinking Race
Sucking creates a partial vacuum or a lower pressurelower pressure in straw above the
liquid that we drink
The higher pressure in outside air pushes the
liquid up the straw in our mouth
The student with the leaky straw cannot
create a vacuum above the liquid, so the liquid
is not pushed up.
![Page 14: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/14.jpg)
Density of Air DensityDensity = Mass / Volume
Warm air is less dense than cool air. Warm air rises. Cool air sinks.
Air at high altitudes is less
dense than air at lower altitudes.
![Page 15: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/15.jpg)
Factors that affect Air Factors that affect Air Pressure Pressure
TemperatureTemperature
Water Vapor
Elevation
![Page 16: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/16.jpg)
TEMPERATURE AND AIR PRESSUREHeat= Heat= Molecules move faster=Molecules move faster= molecules move apart, become molecules move apart, become fewer, weight less=fewer, weight less= less, low air less, low air pressurepressure
HIGH (Hot) TEMPERATURE= LOW AIR PRESSURE
LOW (Cold) TEMPERATURE=HIGH AIR PRESSURE
![Page 17: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/17.jpg)
AMOUNT OF WATER VAPOR
Consists of air and water molecules
![Page 18: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/18.jpg)
Amount of Water VaporAmount of Water Vapor
More water vapor means less air molecules= Low Air Pressure
Dry air (less water vapor)= High Air Pressure
![Page 19: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/19.jpg)
Measuring Measuring Air PressureAir Pressure
Air Pressure is measured by an instrument called A Barometer
Types of BarometerMercury BarometerAneroid
![Page 20: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/20.jpg)
Air pressure increases, column of mercury rises
Air pressure decreases, column of mercury drops
![Page 21: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/21.jpg)
Air Pressure & WeatherAir Pressure & Weather
![Page 22: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/22.jpg)
High pressure generally means fair weather
Air mass in upper atmosphere is sinking (cold, dense air)
Layer of Air
Warm, moist air cannot rise
No clouds
![Page 23: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/23.jpg)
Low pressure generally means cloudy, rainy weather
Air masses move apart
Warm air rises, clouds form
![Page 24: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/24.jpg)
Weather Map SymbolsWeather Map Symbols
![Page 25: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/25.jpg)
Factors Affecting Air PressureFactors Affecting Air PressureFACTOR Increase/Decrease Air Pressure
Density
Density
Temperature
Temperature
Water Vapor
Water Vapor
Altitude
Altitude
![Page 26: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/26.jpg)
QUESTIONS – use your QUESTIONS – use your knowledge of air pressure to knowledge of air pressure to
explain the following situationsexplain the following situations A falling barometer is followed by A falling barometer is followed by
several days of rainy weather.several days of rainy weather. Some people find it hard to Some people find it hard to
breathe at high altitudes.breathe at high altitudes. A rising barometer indicates a A rising barometer indicates a
spell of cool dry weather.spell of cool dry weather.
![Page 27: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/27.jpg)
Air Pressure: Pushing the WeatherAir Pressure: Pushing the Weather
HomeworkHomework
![Page 28: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/28.jpg)
Fronts
•I can describe the causes and effects (weather conditions) of cold fronts, warm fronts, and stationary fronts.
![Page 29: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/29.jpg)
Air Masses
•Air masses are huge chunks air that is the same temperature and density.
![Page 30: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/30.jpg)
What are Fronts?• Fronts happen
when 2 different air masses meet BUT they do not mix together
•4 Different Types of Fronts:
• Cold Front• Warm Front• Occluded Front• Stationary FrontFronts: Mr Parr Rap Song
![Page 31: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/31.jpg)
How do air masses move?• Cold air (more dense)
ALWAYS sinks under warm air (less dense).
• So what is the difference between the 4 types of fronts?– Which air mass takes
over the other! It’s a battleground.
– One air mass is pushing the other out of the way because it does not want to mix!
Video on Air Masses: http://www.youtube.com/watch?v=vPC5i6w3yDI&feature=related
![Page 32: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/32.jpg)
Demos:
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization
• Lab Demos: – Hot/cold air (via water) demo
Hot and Cold Water Demo:http://www.youtube.com/watch?v=Ak9CBB1bTcc&feature=related
![Page 33: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/33.jpg)
Cold Front Warm Front Stationary Front
What is happening?
(Write it)
What is happening?
(Draw it)
Weather forecast
Symbol
![Page 34: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/34.jpg)
Cold FrontsWhat happens? A
fast moving cold air mass runs into a slow moving warm air mass, pushing the warm air up quickly to form clouds.
Weather forecast: heavy rains and thunderstorms
![Page 35: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/35.jpg)
Cold Front: Weather map symbol
• A cold front symbol—The direction that the teeth point indicate the direction the front is moving.
![Page 36: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/36.jpg)
Warm FrontsWhat happens? A fast moving warm air mass collides with a slowly moving cold air mass. Warm air slowly moves over the cold air.
Weather forecast: slow steady rain!
![Page 37: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/37.jpg)
Warm front: Weather Map Symbol
• Warm Front symbol—The directions that the bumps face is the direction the front is moving.
![Page 38: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/38.jpg)
What types of fronts can you find on the map? In which direction are they
moving?
![Page 39: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/39.jpg)
Stationary FrontWhat happens: A cold air mass and warm air mass meet, but neither air mass has enough force to move the other air mass.
Can sometimes mix together OR will turn into a warm or cold front.
Weather forecast: clouds, rain for multiple days
![Page 40: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/40.jpg)
Stationary Front: Weather Map Symbol
Not moving in any direction!
![Page 41: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/41.jpg)
Occluded Front
• What happens:
An occluded front happens when a cold front overtakes the warm front in a low pressure storm system.
Weather forecast: Precipitation will diminish and the winds will lessen.
![Page 42: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/42.jpg)
What types of fronts can you find on the map? In which direction are they
moving?
![Page 43: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/43.jpg)
Summary of Front Symbols
![Page 44: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/44.jpg)
Practice Reading Weather MapsWhich types of fronts can you find on this
map?
![Page 45: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/45.jpg)
What types of fronts are on the map? In which direction are they moving?What type of weather would it produce?
![Page 46: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/46.jpg)
What types of fronts are on the map? In which direction are they moving?What type of weather would it produce?
![Page 47: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/47.jpg)
What types of fronts are on the map? In which direction are they moving?
What type of weather would it produce?
![Page 48: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/48.jpg)
Analyze a Map
![Page 49: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/49.jpg)
Front Classification• 1. When a warm air mass moves in on a cold air mass.• 2. When a warm and cold air mass meet, but neither one has
enough force to rise over the other.• 3. Brings gentle rains that may last for hours or days. • 4. Strong winds are formed followed by heavy rain, crashing
thunder, and flashing lightning. • 5. When the front passes, the temperature warms up and it
becomes humid. • 6. When the front passes, the weather turns cooler. • 7. Tornados could occur. • 8. Usually happens and is over with quickly. • 9. Stay in the same area for a long period of time. • 10. When a cold air mass moves in on a warm air mass. 11.
Causes warm air to move up slowly • 12. Causes warm air to move up quickly
![Page 50: Air Pressure I can compare and contrast high and low pressure systems. I can describe that high pressure systems result in fair weather due to air sinking,](https://reader036.vdocuments.mx/reader036/viewer/2022070413/5697bfb71a28abf838c9eaf2/html5/thumbnails/50.jpg)
Interpreting Weather Maps
• In groups, complete the interpreting weather maps activity
• When finished, work on the “Reading a Weather Map” Worksheet