Objective: SWBAT explain air pressure and the role it plays creating winds WARM UP: 1.Where is Earth’s atmosphere most dense? 2.What is air pressure? Air.

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Presentation transcript:

Objective: SWBAT explain air pressure and the role it plays creating winds WARM UP: 1.Where is Earth’s atmosphere most dense? 2.What is air pressure? Air Pressure and Wind, Part 1

Two important ideas help form WIND… AIR PRESSURE and the UNEVEN HEATING of the EARTH

Reading Study Guide 2.1 What do you remember about density? Air Pressure: the force of air molecules on an area Air Pressure and Altitude: pg 44 diagram

Air pressure and density are HIGHER at a lower altitude Air pressure and density are LOWER at a higher altitude Think of it…like you’re at the bottom of a “swimming pool “ full of the atmospheric air

Weather Instruments at Work On your Reading Study Guide… Barometer: any instrument that measures air pressure

Demonstration 1: Candle in a Flask OBSERVATIONSI THINK…… DIAGRAMNOW I KNOW……

What Happened? Now I Know…. That the water was pushed into the flask because of an air pressure difference

Uneven Heating of the Earth Is the Earth evenly heated? Globe/ flashlight example More direct sunlight= warmer temperatures Less direct sunlight= cooler temperatures

Wind (See back of Reading Study Guide) Uneven heating of Earth’s surface causes changes in pressure, which makes air MOVE! Think back…to the convection currents Warm air RISES, cool air SINKS Page A 48: this is a common pattern of air caused by uneven heating of the earth’s surface

Air Pressure and WIND Have you ever heard a weather forecaster talk about… “LOW PRESSURE” or “HIGH PRESSURE AREAS” when they are predicting the weather? Air Pressure Guided Notes Handout-! Fill in the blanks as you follow along on the document camera

Earth’s Rotation Affects Wind Direction Global winds can travel thousands of kilometers and last for weeks Coriolis Effect- definition found on back of your Reading Study Guide from last class

Coriolis Effect: the curving of global winds as a result of Earth’s rotation

Coriolis Effect Textbook Page A 49 Answer the questions in your notebook! What does this tell you about the Coriolis Effect? terc/content/visualizations/es1904/es1904page0 1.cfm terc/content/visualizations/es1904/es1904page0 1.cfm

Complete Reading Study Guide 2.2 On the back of your sheet from last class Use the textbook if needed We will continue our study of winds next class