Question

determine whether each example of thermal energy transfer demonstrates conduction, radiation, or convection. select the correct answer in each row. example of thermal energy transfer | conduction | radiation | convection air rising above hot concrete in the summer | ○ | ○ | ○ chocolate melting in your hand | ○ | ○ | ○ food cooking in a microwave oven | ○ | ○ | ○

Explanation:

1. For "Air rising above hot concrete in the summer": Convection is heat transfer by movement of fluids (air is a fluid). Hot air rises, so this is convection.
2. For "Chocolate melting in your hand": Conduction is heat transfer through direct contact. Your hand and chocolate are in direct contact, so this is conduction.
3. For "Food cooking in a microwave oven": Radiation is heat transfer via electromagnetic waves (microwaves are a type of EM wave), so this is radiation.

Answer:

• Air rising above hot concrete in the summer: Convection (select the radio button under "Convection" for this row)
• Chocolate melting in your hand: Conduction (select the radio button under "Conduction" for this row)
• Food cooking in a microwave oven: Radiation (select the radio button under "Radiation" for this row)