1. Wind Ch.2 Sec. 3

2. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low

3. These differences in air pressure result from uneven heating –Hot air = less dense = lower pressure –Cold air = more dense = higher pressure

5. If a cooler area is next to a warmer area the air will flow from cool to warm Cooler air tends to be lower down so it flows under warmer air –Warmer air gets pushed up

7. Measuring wind Two properties –Direction –Speed

8. Wind direction Measured with a wind vane Vane points to where wind is coming from This direction give wind its name –Ex. A north wind blows from the north to the south

9. Wind speed Measured with an anemometer –Wind causes it to spin –Speedometer measures speed of spinning

10. Effect of wind Can affect how warm/cold it feels outside Wind-chill factor –Increased cooling due to wind –The stronger the wind the colder it feels

11. Types of Winds Local winds Monsoons Global winds Jet streams

12. Local winds Blow over short distances Caused by unequal heating within a small area Only happen if no wind from farther away

13. Often felt near bodies of water Water heats and cools more slowly than land

14. During the day land is warmer than water  wind from water –Sea breeze At night the water is warmer than land  wind towards water –Land Breeze