What you need: 2 jars, cardboard, food color (blue and red)
What to do: Dissolve the food colors in separate jars. The red jar contains warmer water and the blue jar contains colder water. Place two jars with one on top of the other. A cardboard separates the two. After that, gently remove the cardboard. Observe and record what happens.
Now, reverse the jars' positions then carefully remove the cardboard. Observe and record what happens.
Guide Questions:
1. What is the direction of the flow of warm water and cold water in the first set up?
2. What is the direction of the flow of warm water and cold water in the second set up?
3. What is the direction of heat flow in liquids?
4. If both jars are equally hot, what do you think will happen? Why? 5. If both jars are equally cold, what do you think will happen? Why?
6. What conclusion about heat transfer can you formulate or draw out from this activity?
