Question
Answer
Points
1
What is the role of density changes in a convection cycle?
2
Compare what happens with the red dye in the water bin with what happens to a hot air balloon surrounded by cool air.
3
Recall that matter cannot move without energy. What is the energy source that moves the red dye? What is the energy source that moves the blue dye?
4
Why is the motion of the water in the bin considered a cycle? What could stop the cycle? What could accelerate it?
5
Describe the forces that moved the floating pieces of chocolate (or wax) during Part 2 of the activity. How did the forces relate to the direction of water flow in the bin?
6
Water has a low viscosity (thickness). How might the movement of the dyes change if a fluid with a higher viscosity is used?
7
Evaluate the food coloring and water bin model. What are its strengths and limitations in modeling thermal convection
8
Explain how density changes in a convection cycle contribute to the transfer of heat.