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Review: Pressure is the force exerted on an object over a certain area.

Review: Pressure is the force exerted on an object over a certain area. . As volume increases, pressure decreases As temperature increases, pressure increases Atmospheric pressure changes with altitude. As altitude increases, atmospheric pressure decreases. . What is wind and what causes wind?

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Review: Pressure is the force exerted on an object over a certain area.

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  1. Review: Pressure is the force exerted on an object over a certain area. • As volume increases, pressure decreases • As temperature increases, pressure increases • Atmospheric pressure changes with altitude. As altitude increases, atmospheric pressure decreases.

  2. What is wind and what causes wind? • Uneven heating of the Earth’s surface by the Sun causes some areas to be warmer than others. • When air is heated, it expands and rises, resulting in lower pressure over a given area. • When air is cooled, it condenses and sinks, resulting in higher pressure over a given area. • Air heats/rises and then cools/sinks which causes wind patterns and air movement

  3. North Pole Equator South Pole

  4. Coriolis Effect • Wind is also influenced by the movement of the Earth, known as the CoriolisEffect. • The Earth rotates. The movement of the Earth causes moving air to seem to move to the right north of the equator and to the left south of the equator. Uneven heating of the Earth and the CoriolisEffect create • GLOBAL WINDS

  5. Global Winds

  6. Local Winds are caused by air movement around some geographic features. • Cool air over land sinks • Land Breeze moves out over water • Relatively warmer water heats air which then rises • Upper level return sea breeze • Cool air over land sinks • 1. Warm air over land rises • Sea Breeze moves inland as a cold front • Clouds develop aloft and move seaward • Upper level return land breeze • Cool air sinks over water

  7. Air On the Move (Pgs 22-24) • 1. How is weight defined by the author? • 2. What formula does the author give to help you determine how much pressure you exert on the ground? • 3. According to the author, why don’t you notice the force of air pushing down on you? • 4. Why is the pressure greatest at the Earth’s surface? Why does air pressure decrease as you go up? What in the text supports your answer? • 5. According to the author, why is wind always moving to areas of lower pressure?

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