Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure...
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Transcript of Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure...
![Page 1: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/1.jpg)
Wind
Ch.2 Sec. 3
![Page 2: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/2.jpg)
What is wind?
• The horizontal movement of air
• Caused by differences in air pressure
• Air moves from high to low
![Page 3: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/3.jpg)
• These differences in air pressure result from uneven heating–Hot air = less dense = lower
pressure
–Cold air = more dense = higher pressure
![Page 4: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/4.jpg)
![Page 5: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/5.jpg)
• 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
![Page 6: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/6.jpg)
![Page 7: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/7.jpg)
Measuring wind• Two properties
–Direction
–Speed
![Page 8: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/8.jpg)
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
![Page 9: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/9.jpg)
Wind speed
• Measured with an anemometer–Wind causes it to spin
–Speedometer measures speed of spinning
![Page 10: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/10.jpg)
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
![Page 11: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/11.jpg)
Types of Winds
• Local winds
• Monsoons
• Global winds
• Jet streams
![Page 12: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/12.jpg)
Local winds
• Blow over short distances
• Caused by unequal heating within a small area
• Only happen if no wind from farther away
![Page 13: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/13.jpg)
• Often felt near bodies of water
• Water heats and cools more slowly than land
![Page 14: Wind Ch.2 Sec. 3. What is wind? The horizontal movement of air Caused by differences in air pressure Air moves from high to low.](https://reader035.fdocuments.in/reader035/viewer/2022062722/56649f345503460f94c517de/html5/thumbnails/14.jpg)
• 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