2. New Area of Focus: Air Pressure, The factor that controls the weather. New Area of Focus: Air Pressure, The factor that controls the weather. Copyright © 2010 Ryan P. Murphy

3. Class Demo: Does air have weight? –How could we measure the weight of air? Copyright © 2010 Ryan P. Murphy

4. Air is made of matter. Matter has mass and takes up space. Copyright © 2010 Ryan P. Murphy

6. “Ouch!” “Air molecules are everywhere.”

8. Activity / Demonstration: Balloon in a bottle. –Fit a balloon around the edges of a bottle and push it inside. –Try and blow up the balloon. What happens? –Use a pin to poke a hole in the bottom and try again. –Practice covering the hole and releasing.

9. Activity / Demonstration: Balloon in a bottle. –Fit a balloon around the edges of a bottle and push it inside. –Try and blow up the balloon. What happened? –Teacher to use a nail and hammer to poke a hole in the bottom and try again. (Eye protection) –Practice blowing up the balloon and then plugging with your finger when inflated.

10. Air Pressure: The pressure caused by the weight of the atmosphere. Air Pressure: The pressure caused by the weight of the atmosphere. Copyright © 2010 Ryan P. Murphy

11. Air Pressure: The pressure caused by the weight of the atmosphere. Air Pressure: The pressure caused by the weight of the atmosphere. Copyright © 2010 Ryan P. Murphy

12. Air pressure applies a force equal in all directions. Air pressure applies a force equal in all directions. Copyright © 2010 Ryan P. Murphy

13. Air pressure applies a force equal in all directions. Air pressure applies a force equal in all directions. Copyright © 2010 Ryan P. Murphy

14. As elevation increases, air pressure decreases. As elevation increases, air pressure decreases. Copyright © 2010 Ryan P. Murphy

15. As elevation increases, air pressure decreases. As elevation increases, air pressure decreases. Copyright © 2010 Ryan P. Murphy

16. As elevation increases, air pressure decreases. As elevation increases, air pressure decreases. Copyright © 2010 Ryan P. Murphy

17. As elevation increases, air pressure decreases. As elevation increases, air pressure decreases. Copyright © 2010 Ryan P. Murphy

22. Mt. Everest – Death Zone past camp IV because there are very few air molecules. Copyright © 2010 Ryan P. Murphy

23. Mt. Everest – Death Zone past camp IV because there are very few air molecules. –Including oxygen Copyright © 2010 Ryan P. Murphy

25. As you increase in elevation As you increase in elevation Copyright © 2010 Ryan P. Murphy

26. As you increase in elevation As you increase in elevation Copyright © 2010 Ryan P. Murphy

27. As you increase in elevation As you increase in elevation Copyright © 2010 Ryan P. Murphy Low Pressure

28. As you increase in elevation air pressure decreases. As you increase in elevation air pressure decreases. Copyright © 2010 Ryan P. Murphy Low Pressure

29. As you increase in elevation air pressure decreases. As you decrease in elevation As you increase in elevation air pressure decreases. As you decrease in elevation Copyright © 2010 Ryan P. Murphy Low Pressure

30. As you increase in elevation air pressure decreases. As you decrease in elevation As you increase in elevation air pressure decreases. As you decrease in elevation Copyright © 2010 Ryan P. Murphy Low Pressure

31. As you increase in elevation air pressure decreases. As you decrease in elevation As you increase in elevation air pressure decreases. As you decrease in elevation Copyright © 2010 Ryan P. Murphy Low Pressure High Pressure

32. As you increase in elevation air pressure decreases. As you decrease in elevation pressure increases. As you increase in elevation air pressure decreases. As you decrease in elevation pressure increases. Copyright © 2010 Ryan P. Murphy Low Pressure High Pressure

33. As you increase in elevation… –air pressure decreases.

34. As you increase in elevation… –Air pressure decreases.

35. Low Pressure

36. Higher Pressure

37. Water is heavy and can create enormous pressures as you go down in depth.

40. Barometer: Instrument that measures air pressure. Barometer: Instrument that measures air pressure. Copyright © 2010 Ryan P. Murphy

41. Standard sea-level pressure is 14.7 lb per sq in. (1,030 grams per sq cm), which is equivalent to a column of mercury 29.92 in. (760 mm) in height; The decrease with elevation is approximately 1 in. (2.5 cm) for every 900 ft (270 m) of ascent. Copyright © 2010 Ryan P. Murphy

42. Standard sea-level pressure is 14.7 lb per sq in. (1,030 grams per sq cm), which is equivalent to a column of mercury 29.92 in. (760 mm) in height; The decrease with elevation is approximately 1 in. (2.5 cm) for every 900 ft (270 m) of ascent. Copyright © 2010 Ryan P. Murphy

44. A rising barometer = Increasing air pressure. This usually means… Copyright © 2010 Ryan P. Murphy

45. High pressure = Good Weather Copyright © 2010 Ryan P. Murphy

46. Low Pressure = Poor weather coming

48. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck

49. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest

50. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest

51. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level

52. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level Jet Plane

53. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level Jet Plane

54. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level Bottom of a Pool Jet Plane

55. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level Bottom of a Pool Jet Plane

56. Word Bank: Titanic wreck, Top of Mt. Everest, sea- level, jet plane, bottom of your pool, hot air balloon.  High PressureLow Pressure  Copyright © 2010 Ryan P. Murphy Titanic Wreck Top of Mt. Everest Sea-Level Bottom of a Pool Jet Plane Hot Air Balloon

57. Activity! Marshmallow torture

58. –Place Marshmallow into Bell Jar vacuum. –Remove Air from Bell Jar –Record Picture of Marshmallow. –Quickly let air rush back in and observe.

59. Activity! Marshmallow torture –Place Marshmallow into Bell Jar vacuum. –Remove Air from Bell Jar –Record Picture of Marshmallow. –Quickly let air rush back in and observe.

60. Activity! Marshmallow torture –Place Marshmallow into Bell Jar vacuum. –Remove Air from Bell Jar –Record Picture of Marshmallow. –Quickly let air rush back in and observe.

61. Activity! Marshmallow torture –Place Marshmallow into Bell Jar vacuum. –Remove Air from Bell Jar –Record Picture of Marshmallow. –Quickly let air rush back in and observe.