1 / 20

Air Pressure

Air Pressure. What is air pressure? How does it affect weather?. Air Pressure. Can you feel air pressure?.

phila
Download Presentation

Air Pressure

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Air Pressure What is air pressure? How does it affect weather?

  2. Air Pressure

  3. Can you feel air pressure? When you take off or land in an aircraft, your ears may hurt or feel uncomfortable. This is because your eardrums can feel changes in air pressure as the aircraft moves quickly up and down. But what is air pressure?

  4. What is Air Pressure? • It is caused by the weight of all the air in the atmosphere pressing down on Earth. • It is also known as atmospheric pressure. • Air pressure changes with the height and also when air warms up or cools down. • Changes in air pressure cause changes in the weather.

  5. Air Pressure Air’s pressure is pretty heavy at sea level. It is equivalent to (like) an elephant balancing on a desk!

  6. Air Pressure There is more pressure near the Earth’s surface and less when you go further into the atmosphere.

  7. Quick Write! • Where is air pressure higher? On a mountain or near the beach? Why?

  8. What do you remember about Hot and Cold air? Draw a picture here

  9. Differences in air pressure Low Pressure • When air rises, it leaves behind an area of lower pressure, because the upward- moving air is not pressing down so hard on the surface.

  10. High Pressure • Areas of high pressure are formed where air is sinking back down, and so pushing down harder. • >> see the diagram

  11. Since there are many areas of high and low pressure above the Earth’s surface due to uneven surface heating. • Air moves from high pressure to low pressure forming winds. • As a result, the greater the difference between the high pressure and low pressure areas is, the higher the wind speed is.

  12. Highs and Lows • Pressure is different all over the world. • Lows are areas of low pressure with the lowest pressure at the center. • Lows usually bring wet, cloudy weather.

  13. Highs are areas of high pressure with the highest pressure at the center. • Highs bring sunnier, and dry weather. • The way these move from day to day causes the changes in the weather.

  14. Cold Air High Pressure looks like this in weather: Creates High Pressure

  15. Hot Air Low Pressure looks like this in weather: Creates Low Pressure

  16. Quick Write High Pressure Low Pressure What are its causes and effects? • What are its causes and effects?

  17. Your Turn! Compare and Contrast What is low and high pressure? What are their causes? How are they different or the same? Complete the worksheet. Make sure you include both diagrams and writing. Fill out the whole sheet. It is worth 5 points.

  18. Measuring Air Pressure • Air Pressure is measured in millibars (mb) on a barometer. • The simplest kind of barometer is a mercury barometer and pressure is measured in mm (in) of mercury. • An aneriod barometer can measure move conveniently. • A barograph is a special kind of barometer, which records continuous changes in air pressure.

  19. Photos I • A aneroid barometer

  20. Photos II • A barograph

More Related