Lesson 3 Reading One: Why Learn about Convection? (p. 54-55 - ES2)

1. What happens if you hold the marshmallows above the fire or coals and slowly turn the stick?

2. Why do sparks from the fire rise and swirl above the fire?

3. What is CONVECTION?

How Does Convection Toast the Marshmallow?

4. How does convection toast the marshmallow?

5. What happens to both matter and energy when a fire burns? (Use and circle the following terms in your response: matter; energy; dense or denser; space between the molecules)
6. Draw and label a diagram that shows convection taking place around a fire.

7. Describe what happens to the air above the fire.

8. Describe what happens to the cooler air near the fire?

9. What causes the sparks to swirl above the flame?

10. Explain why is it that if you put your marshmallow directly in the fire, it will burn?

11. How about if you put your marshmallow over hot coals, not fire. What will happen?

12. Why do the cookies in the top rack of the oven cook faster than the ones in the bottom rack?

13. Explain why this natural convection occurs in all ovens.

14. How does a convection oven work?

15. How is convection oven different from the natural convection?

What is the more accurate term for convention ovens and why?