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AIR PRESSURE
Air pressure is the force exerted by air molecules pushing down on a surface. It depends on factors like elevation, temperature, and humidity. Air pressure decreases with increasing altitude and temperature, and increasing humidity. It can be measured using a barometer. Changes in air pressure affect the weather, with low pressure typically bringing stormy conditions and high pressure typically resulting in fair skies.
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AIR PRESSURE
- 1. AIR PRESSURE NURUL FADHILAHBINTI ALIAS P89162
- 2. DOYOU STILL REMEMBER? •Define Pressure as N/m2 • Explain why pressure depends upon surface area • Calculate Pressure given relevant data • Justify how pressure is affected by car tyres Why would a lady in high heels standing on your foot hurt more than an elephant standing on your foot?
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- 4. DOESTHE AIR HASMASS? • Click the link to confirm whether air has mass or not • https://youtu.be/ 8vK5ksK4wFs?t=62 • Now, write in note book of what you see and what you learn. You can also draw and label the diagram of the activity. Is that true? Do you believe that air has mass? AIR AIR
- 5. SO NOW WEKNOW THAT AIR HAS MASS & WEIGHT, HOW THAT RELATES TO AIR PRESSURE? Can you feel the air pressure?
- 6. AIR PRESSURE • Airpressure is the measure of the force which air molecules push on a surface. • Air Pressure is GREATEST at the surface of the Earth because there is more of the atmosphere above you to push down on you.
- 7. • As youmove UP through the atmosphere, air pressure decreases. Graph of altitude against air pressure What do you understand from the graph? Write in your notes.
- 8. AIR PRESSURE ISDEPENDANT ON DENSITY • More dense air will have a higher air pressure- there are more air molecules in a given space to push down on you • Less dense air will have a lower air pressure- there are fewer air molecules to push down on you. More Dense= more particles to push down on you Less Dense= fewer particles to push down on you
- 9. AIR PRESSURE ISAFFECTED BY 3 FACTORS • 1- Elevation, or altitude • 2- Temperature • 3- Humidity/ Water content
- 10. The people atthe bottom of the pyramid can feel all the weight and pressure of the people on top (high pressure). The person on the top doesn’t feel any weight (less pressure).
- 11. IMPACT OF ELEVATIONON AIR PRESSURE • As you move up through the atmosphere, air pressure decreases. – There are fewer air molecules above you to push down on you, so the force of the air will be less.
- 12. Observe and comparethe no. of particles ‘above’ the guy at the top to the guy at the sea level (bottom)
- 13. IMPACT OF TEMPERATUREON AIR PRESSURE • Warm air is less dense than cold air. Therefore, warm air has a lower air pressure and cold air has a higher air pressure. – The molecules in warm air are moving fast and are spread farther apart. Therefore there are fewer air molecules in a given area to push down on you. Warm Air Cold Air
- 14. Could Air Crusha Metal Tank Car ????? The inside of this tank car was washed out and cleaned with HOT steam. Then all the outlet valves were shut . The tank car was sealed. All the workers went home for the evening. In the morning when they returned this is what they found. This tank car was smashed, crushed, or collapsed by an unseen force why?
- 15. IMPACT OF WATERCONTENT OR HUMIDITY, ON AIR PRESSURE • Moist air is less dense than dry air, and therefore has a lower air pressure. • A water molecule has less mass than other molecules that make up the air. If you replace some of the air molecules with water molecules, the water lowers the density (and lowers the air pressure) O N O N H2O O H2O N Weighs less since H2O is lighter than Nitrogen and Oxygen
- 16. As altitude increases .. Air pressure As temperature increases . . As humidity increases . . Air pressure Air pressure decreases decreases decreases
- 17. How do youmeasure air pressure and atmospheric pressure?
- 18. BAROMETER • The pieceof equipment used to measure air pressure is a Barometer Aneroid Barometer Mercury Barometer
- 19. h Notice that aboveA, is vacuum! Will the value of h change if The vacuum part is filled With air? Discuss
- 20. AIR PRESSURE AFFECTSTHE WEATHER • Air pressure in a weather system reflects the amount of water in the air, which affects the weather. Low air pressure usually results in Bad weather: stormy, cloudy, overcast. High air pressure usually results in Good weather: clear skies, no precipitation
- 21. High Air Pressure Highair pressure brings clear and weather. H skies fair
- 22. Low Air Pressure Lowair pressure brings . L PRECIPITATION