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Air Pressure Activities

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.

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Air Pressure Activities

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  1. 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

  2. Air Pressure

  3. Air Pressure • Air Pressure is a measure of the force of the air pressing down on the earth’s surface

  4. Air Pressurecan vary at any particular point on the Earth depending on the density of the air • Density = mass / volume

  5. Title: Activity 1. Inverted Cup Date: Feb. 2010 Summary:

  6. Inverted Cup 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. cardboard Air Pressure There is higher air pressure outside pushing upward than the inside of cup pushing downward.

  7. Title: Activity 2. Stop the Leak Date: Feb. 2010 Summary:

  8. Stop the Leak By 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 out Air pressure outside of can is greater than air pressure inside.

  9. Title: Activity 3. Collapsing Can Date: Feb. 2010 Explain the principle behind the collapsing can. Summary:

  10. Collapsing 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.

  11. Title: Activity 3. Straw drinking race Date: Feb. 2010 Regular straw Modified straw 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? Summary:

  12. Straw Drinking Race 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. Sucking creates a partial vacuum or a lower pressure in straw above the liquid that we drink

  13. Density = 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.

  14. Factors that affect Air Pressure • Temperature • Water Vapor • Elevation

  15. TEMPERATURE AND AIR PRESSURE Molecules move faster HEAT Move apart, become fewer and weigh less LESS AIR PRESSURE

  16. HIGH TEMPERATURE, LOW AIR PRESSURE LOW TEMPERATURE, HIGH AIR PRESSURE

  17. AMOUNT OF WATER VAPOR consists of air and water molecules

  18. More water vapor means less air molecules LOW AIR PRESSURE DRY AIR = HIGH AIR PRESSURE

  19. Factors Affecting Air Pressure

  20. Measuring Air Pressure Types of Barometer Air Pressure is measured by an instrument calledBarometer • Mercury Barometer • Aneroid

  21. Air pressure increases, column of mercury rises • Air pressure decreases, column of mercury drops

  22. Air Pressure & Weather

  23. High pressure generally means fair weather Air mass in upper atmosphere No clouds Warm, moist air cannot rise Layer of Air

  24. Low pressure generally means cloudy, rainy weather Warm air rises, clouds form Air masses move apart

  25. QUESTIONS – use your knowledge of air pressure to explain the following situations • A falling barometer is followed by several days of rainy weather. • Some people find it hard to breathe at high altitudes. • A rising barometer indicates a spell of cool dry weather.

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