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From: Monster Storms Mission 1: The Usual Suspects (pp: 20)
Observing Convection

Convection is a process that helps distribute heat energy from Earth’s surface into the atmosphere. Under the right conditions, this process fuels monster storms. In this lab, students have a chance to observe this process on a very small scale using soap and water.

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Lab 3 - observing convection

Dynamics of an Atmospheric Convection Cell
Dynamics of an atmospheric convection cell
When studying a monster storm, scientists like Anthony Guillory measure temperature data from the air and from the water bodies that their planes and UAVs fly over. This information is important because it helps scientists predict how strong the winds might become.
 
Convection is a process that helps distribute heat energy from Earth’s surface into the atmosphere. Under the right conditions, this process fuels monster storms. Convection also occurs beneath Earth’s surface in the mantle, where currents of slowly flowing molten rock help move the massive tectonic plates that make up Earth’s outer layer. Convection in the oceans also helps mix water layers and distributes heat. In this lab, you will observe this process on a very small scale using just soap and water!


Materials
  • ice cubes
  • pearlized soap
  • warm water
  • beaker or glass
  • room-temperature water
  • tablespoon
  • flashlight (optional)
  • bowl

Lab Prep
  1. Fill the beaker with room-temperature water and add about a tablespoon of pearlized liquid soap. Mix the soap into the water. What happens?

  2. Place the beaker in the bowl and fill the bowl with warm water. Place some ice cubes in the beaker. What does the mixture do?

  3. Describe the heat transfer occuring in this experiment

  4. What do you think would happen to the movement of the soap if you let the beaker sit for an hour?

  5. How does this activity model the movement of air in the atmosphere (or the movement of water in the oceans)?

Make Observations
  1. Design and implement an experiment to answer one of the following questions. Have your teacher approve your design before you start.

    1. Does the size or shape of the container (the beaker or glass in the Lab Prep) affect the way convection currents move?

    2. What happens if objects that get in the way of the soap’s movement are placed at the bottom of the container?

    3. Does a larger temperature difference between the inside and the outside of the container have a major effect on the movement of the soap?

  2. How does your experiment help answer the research question that you chose?

journal icon Journal Question  
Earth receives more heat at the equator than at the poles. How do wind currents result? What is the overall effect of winds on Earth? 

 


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