Pgs. 168- 177 For Student Use Only 7 th  Grade Chapter 5 Lesson 3
Ocean of Air <ul><li>How are fish at the bottom of the ocean different from fish at the surface? </li></ul>Pressure is in ...
<ul><li>Air is a mixture </li></ul><ul><ul><li>Nitrogen- most abundant (78%) </li></ul></ul><ul><ul><li>Oxygen- next abund...
Ocean of Air <ul><li>Properties of Air: </li></ul><ul><ul><li>Gases (and liquids) are fluids </li></ul></ul><ul><ul><ul><l...
Ocean of Air <ul><li>Properties of Air </li></ul><ul><ul><li>Gases expand to fill container </li></ul></ul><ul><ul><li>Gas...
Ocean of Air <ul><li>Gas Laws </li></ul><ul><li>Boyle’s Law </li></ul><ul><li>Charles Law </li></ul><ul><li>Combined Gas L...
Boyle’s Law <ul><li>Boyle’s Law states: </li></ul><ul><li>If the Temperature of a gas remains constant, its volume and pre...
Charles’s Law <ul><li>Charles’s Law states: </li></ul><ul><li>If the pressure of a gas remains constant, its volume and te...
Other Information  <ul><li>Information about Air </li></ul><ul><li>Air expands when heated! </li></ul><ul><li>Air contract...
Combined Gas Law <ul><li>Combined Gas Law states: </li></ul><ul><li>If the volume of a gas is held constant its pressure a...
Other Information  <ul><li>Air Pressure </li></ul><ul><li>Atmospheric Pressure: </li></ul><ul><ul><li>Air pressure is more...
Air Pressure <ul><li>Measuring Air Pressure </li></ul><ul><li>Barometer- what is used to air pressure </li></ul><ul><li>To...
Meteorologists <ul><li>Meteorologists: </li></ul><ul><li>Measure air pressure to help predict weather </li></ul><ul><ul><l...
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7th Grade Chapter 5 Lesson 3 Slideshare

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  • 7th Grade Chapter 5 Lesson 3 Slideshare

    1. 1. Pgs. 168- 177 For Student Use Only 7 th Grade Chapter 5 Lesson 3
    2. 2. Ocean of Air <ul><li>How are fish at the bottom of the ocean different from fish at the surface? </li></ul>Pressure is in the ocean and in the sky. Air pressure is the force of air pushing down on you.
    3. 3. <ul><li>Air is a mixture </li></ul><ul><ul><li>Nitrogen- most abundant (78%) </li></ul></ul><ul><ul><li>Oxygen- next abundant (20%) </li></ul></ul><ul><ul><li>Also made up of: </li></ul></ul><ul><ul><ul><li>Carbon Dioxide </li></ul></ul></ul><ul><ul><ul><li>Ozone </li></ul></ul></ul><ul><ul><ul><li>Water Vapor </li></ul></ul></ul><ul><li>What air does: </li></ul><ul><ul><li>Helps sound travel </li></ul></ul><ul><ul><li>Protects Earth from radiation </li></ul></ul><ul><ul><li>Oxygen helps us breathe and have fire </li></ul></ul><ul><ul><li>Nitrogen dilutes oxygen in the air </li></ul></ul>Ocean of Air
    4. 4. Ocean of Air <ul><li>Properties of Air: </li></ul><ul><ul><li>Gases (and liquids) are fluids </li></ul></ul><ul><ul><ul><li>Fluids= a substance that flows from one area to another </li></ul></ul></ul><ul><ul><li>Why are water and air different? </li></ul></ul><ul><ul><li>Water’s molecules are close together and stick together </li></ul></ul><ul><ul><li>Air does not stick together and are far apart </li></ul></ul>
    5. 5. Ocean of Air <ul><li>Properties of Air </li></ul><ul><ul><li>Gases expand to fill container </li></ul></ul><ul><ul><li>Gases spread out evenly </li></ul></ul><ul><li>Liquid Vs. Air </li></ul><ul><ul><ul><li>Liquid- def. vol. but NO def. shape </li></ul></ul></ul><ul><ul><ul><li>Air- NO def. shape and NO def. Volume </li></ul></ul></ul><ul><li>Diffusion- the random spreading of one fluid throughout another </li></ul>
    6. 6. Ocean of Air <ul><li>Gas Laws </li></ul><ul><li>Boyle’s Law </li></ul><ul><li>Charles Law </li></ul><ul><li>Combined Gas Law </li></ul>
    7. 7. Boyle’s Law <ul><li>Boyle’s Law states: </li></ul><ul><li>If the Temperature of a gas remains constant, its volume and pressure are inversely related </li></ul><ul><ul><li>If volume goes up, pressure goes down and vice versa </li></ul></ul><ul><li>Explain this principle in everyday terms. (Use an example) </li></ul>
    8. 8. Charles’s Law <ul><li>Charles’s Law states: </li></ul><ul><li>If the pressure of a gas remains constant, its volume and temperature are DIRECTLY related </li></ul><ul><ul><li>If temperature increases the volume increases and vice versa </li></ul></ul><ul><li>Explain this principle in everyday terms. (Use an example) </li></ul>
    9. 9. Other Information <ul><li>Information about Air </li></ul><ul><li>Air expands when heated! </li></ul><ul><li>Air contracts when cooled. </li></ul><ul><li>Cooler air sinks </li></ul><ul><li>Warmer air rises </li></ul>
    10. 10. Combined Gas Law <ul><li>Combined Gas Law states: </li></ul><ul><li>If the volume of a gas is held constant its pressure and temperature are DIRECTLY related </li></ul><ul><ul><li>If pressure increases so does the temperature and vice versa </li></ul></ul><ul><li>Explain this principle in everyday terms. (Use an example) </li></ul>
    11. 11. Other Information <ul><li>Air Pressure </li></ul><ul><li>Atmospheric Pressure: </li></ul><ul><ul><li>Air pressure is more than one ton at sea level, but your body also pushes outward </li></ul></ul><ul><li>Layers of Atmosphere: </li></ul><ul><ul><li>Troposphere- lowest layer- where gravity pulls all the air </li></ul></ul><ul><ul><li>Stratosphere </li></ul></ul><ul><ul><li>Mesosphere </li></ul></ul><ul><ul><li>Thermosphere </li></ul></ul><ul><ul><li>Exosphere </li></ul></ul>
    12. 12. Air Pressure <ul><li>Measuring Air Pressure </li></ul><ul><li>Barometer- what is used to air pressure </li></ul><ul><li>Torricelli- invented first barometer- used a long glass tube to measure air pressure </li></ul><ul><li>Pascal- figured out that the higher you went the less air would push down and the more mercury would run out of the tube- he was right </li></ul>
    13. 13. Meteorologists <ul><li>Meteorologists: </li></ul><ul><li>Measure air pressure to help predict weather </li></ul><ul><ul><li>Normal average air pressure at sea level is 29.92 inches of Hg </li></ul></ul><ul><ul><li>Air pressure may actually very. </li></ul></ul>

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