Air Pressure and Wind Chapter 19 Air Pressure
- Slides: 17
Air Pressure and Wind Chapter 19 Air Pressure - weight of air pushing in all directions - barometer- device that measures air pressure ex. - air pressure rises = mercury rises air pressure falls = mercury falls
Wind - caused by: 1) Unequal heating of air creates pressure differences. 2) Pressure differences move air from high areas to low areas.
Factors Affecting Wind 1) Pressure Difference - greater difference causes stronger wind 2) Coriolis Effect - Earth’s rotation deflects winds: a) to the right in the Northern Hemisphere b) to the left in the Southern Hemisphere 3) Friction - Earth’s surface can slow wind down
Coriolis Effect
Wind on a Weather Map Isosbars- lines that show air pressure 1) close lines = large pressure differences 2) widely space lines = small pressure differences
Pressure Centers High Pressure - winds blow outward (air sinks, pushing out) - winds move clockwise - pressure is high in the center - creates clear weather
Low Pressure - winds blow inward (air rises, pulling in) - winds move counterclockwise - pressure is low in the center - creates clouds, bad weather
Global Winds - warm air moves toward the poles - cold air moves toward the equator
Examples of Global Winds: 1) Trade Winds - blow east to west at equator
2) Westerlies - blow west to east above trade winds * IN U. S. - weather is affected most by westerlies
3) Polar Easterlies - polar wind that moves east to west
Local Winds - caused by land water heating 1) Land Breeze - at night, land cools moving air away from land. 2) Sea Breeze - during day, land heats moving air to the land.
3) Mountain Breeze - at night, air cools & moves down the mountain into the valley 4) Valley Breeze - during day, air heats & moves up the mountain out of the valley
Anemometer - device that measures wind speed.
El Nino - The heating of cold ocean water in the East Pacific Ocean. - caused by ocean currents going in reverse - affects weather & fishing
La Nina - The cooling of ocean water in the East Pacific Ocean. - also affects weather
Sea breeze usually originates during the
Chapter 19 air pressure and wind
Air pressure
High pressure winds
Measure air temperature and measure air pressure
Kurshalter
Air mass vocabulary
Pt tanah air sentosa
Wind pressure gradient
Coriolis
Power force x velocity
Velocity pressure exposure coefficient
Wind is horizontal movement of air
Bernoulli's principle pipe flow
Osmolarity and osmolality
High pressure and low pressure
Tiefdruckgebiet
Chapter 7 glaciers deserts and wind
