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Air Pressure

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 particular point on the Earth depending on the density of the air. Density = mass / volume. Density = Mass / Volume

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Air Pressure

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  1. Air Pressure

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

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

  4. 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.

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

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

  7. HIGH TEMPERATURE, LOW AIR PRESSURE LOW TEMPERATURE, HIGH AIR PRESSURE

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

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

  10. Factors Affecting Air Pressure

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

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

  13. Air Pressure & Weather

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

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

  16. 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. QUESTIONS – use your knowledge of air pressure to explain the following situations

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