Convection Currents
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Transcript

  • 1. Convection 4-2
  • 2. Uneven Heating Questions
    • What causes Earth’s surface to heat up?
    • What are some of the variables that cause uneven heating of Earth’s surface?
    • What happens to the temperature of equal volumes of soil and water when they are place in the sunshine for 30 minutes?
  • 3. Density
    • What will happen to these objects when I drop them into the water?
    • Object Results
      • Floats - less dense than water
      • Sinks - denser than water
    • Which objects are less dense than water?
    • Which objects are denser than water?
    • Is water denser or less dense than cork?
    • Is a vial cap denser or less dense than a penny?
  • 4. Cold Water Challenge
    • Do you think the blue ice water is denser, less dense, or the same density as room-temperature water?
  • 5. Challenge Procedure
    • Fill vial with room temperature water. Let stand 1 minute undisturbed.
    • Use bulb pipette to take up bulbful of blue cold water.
    • Gently squeeze bulb to release blue cold water on either the bottom or the surface of the vial of water. Use a steady slow squeeze.
    • Observe the vial carefully to determine if the cold water floats or sinks.
  • 6. Observations
    • What happened to the cold blue water when it was placed in room-temperature water?
    • Why do you think the blue water went down?
    • Is the blue ice water denser, less dense, or the same density as room-temperature water?
    • What do you think will happen if you warm up the bottom of the vial where the cold water is sitting?
  • 7. Hot Water Investigation
    • Carefully place the vial with blue water on the bottom into a plastic cup.
    • Fill zip bag half full of hot water, using the syringe. Seal top of bag shut.
    • Slowly lower bag of hot water into the cup with the vial.
    • Closely observe the blue water carefully for 4 minutes.
    • Make accurate illustrations of movement of cold blue water. Write captions under each illustration.
  • 8. Hot-Water Results
    • What happened to the cold blue water in the vials after the hot water was placed beside it?
    • Why do you think the blue water moved up?
    • Why do you think warm water moves up?
    • Why do you think the blue water started to sink after coming to the surface?
    • What pattern did the blue water make after the hot water was added?
  • 9. Vocabulary
    • Materials sink in water if they are denser than water.
    • Materials float in water if they are less dense than water.
    • Convection Current
      • A circular current in a fluid caused by uneven heating
  • 10. Content
    • Is hot water denser or less dense than room-temperature water?
      • Hot water is less dense than room-temperature water.
    • Which is denser, hot water or cold water?
      • Cold water is denser than hot water.
    • What causes a convection current?
      • Occurs when the bottom of a mass of fluid is heated. Warm water rises, cools, and then descends, creating a circular flow.
    • Your questions?
    • Homework: Read Wind! Pg. 202-207 and answer questions.
  • 11. Wind! Questions
    • Explain how convection currents are produced in the air.
    • Explain what causes wind.
    • Describe what happens to air molecules when air is heated.
    • What is the source of energy that causes the wind to blow?