air pressure activities
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Air Pressure Activities. Inverted Glass Stop the Leak Collapsing Can Fastest Drinker. In your notebook: Diagram of set-up Description of results Explanation/principle involved. Air Pressure. Air Pressure. - PowerPoint PPT PresentationTRANSCRIPT
Air Pressure Activities
A.Inverted Glass
B.Stop the Leak
C.Collapsing Can
D.Fastest Drinker
In your notebook:
1. Diagram of set-up
2. Description of results
3. Explanation/principle involved
Air Pressure
Air Pressure• Air Pressure is
a measure of the force of the air pressing down on the earth’s surface
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
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:
Inverted CupInverted Cupcardboard
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.
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:
Stop the LeakStop the LeakBy plugging one of the holes, the air inside stays the same because
outside air is prevented from coming into the hole. The higher
water volume inside causes a decrease in pressure. Thus, outside air pressure (which is
greater) pushes against the water and prevents it from flowing out.
Air cannot go in
Liquid cannot
flow outAir pressure outside of can is Air pressure outside of can is
greater than air pressure inside.greater than air pressure inside.
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.
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.
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
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.
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.
Factors that affect Factors that affect Air Air PressurePressure
TemperatureTemperature
Water Vapor
Elevation
TEMPERATURE AND AIR PRESSURE
HEAT
Molecules move faster
Move apart, become fewer and weigh less
LESS AIR PRESSURE
HIGH TEMPERATURE, LOW AIR PRESSURE
LOW TEMPERATURE, HIGH AIR PRESSURE
AMOUNT OF WATER VAPOR
consists of air and water molecules
More water vapor means less air
moleculesLOW AIR PRESSURE
DRY AIR = HIGH AIR PRESSURE
Factors Affecting Air PressureFactors Affecting Air PressureFACTOR Increase/Decrease Air Pressure
DensityDensityTemperatureTemperatureWater VaporWater VaporAltitude Altitude
Measuring Measuring Air PressureAir Pressure
Air Pressure is measured by an instrument called Barometer
Types of BarometerMercury BarometerAneroid
Air pressure increases, column of mercury rises
Air pressure decreases, column of mercury drops
Air PressureAir Pressure & & WeatherWeather
High pressure generally means fair weather
Air mass in upper atmosphere
Layer of Air
Warm, moist air cannot rise
No clouds
Low pressure generally means cloudy, rainy weather
Air masses move apart
Warm air rises, clouds form
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.