2. Energy Exchanges in the Atmosphere

3. Atmosphere - blanket of gas that surrounds the earth (the air around us)

4. Atmospheric Variables that cause weather conditions Temperature Pressure Air Movement Visibility Humidity

5. Weather - a description of the atmospheric variables at a given place during a short period of time

6. Where does most weather occur? In the TROPOSPHERE which is the LOWEST PART OF THE ATMOSPHERE

7. Atmospheric Variables

8. Temperature Variations affected by Insolation Altitude Clouds Pollution

9. Pressure Variations

10. What causes air Pressure? Gravity

11. Differences in Pressure are due to: Temperature Altitude Humidity

12. Temperature What is heavier warm air or cold air? COLD AIR

13. COLD AIR is more dense and wants to sink causing an increase in pressure

16. Altitude As altitude increases air pressure DECREASES

17. Because a smaller amount of air above you weighs less

19. Effect of Moisture Content or Humidity on Pressure

20. Opposite of what you normally expect

21. As the amount of Water Vapor in the air INCREASES, the weight of the air DECREASES

22. Because: water vapor molecules weigh less than dry air molecules

23. Measuring Air Pressure Air Pressure is measured using a BAROMETER

24. Atmospheric Pressure is measured in MILLIBARS and INCHES

26. Aneroid Barometer

27. ISOBAR- Line of equal air pressure.

28. Isobars are used ON WEATHER MAPS They help show us the location of HIGHS & LOWS

31. Air Movement

32. Wind - the horizontal movement of air

33. Atmospheric Transparency - a measure of the ability of the atmosphere to pass light

34. Dust, Smoke, Water Droplets, etc. in the air are called AEROSOLS / Condensation Nuclei

35. They directly affect Transparency which means, as the stuff in the air increases the amount of light that can pass through decreases.

37. Ingredients of Weather Ingredients of Weather 8min video