Question

ice cream melting in a warm bowl is an example of a transfer of thermal energy by _
○ expansion
○ convection
○ conduction
○ radiation

Explanation:

• Expansion: It is a physical change related to the increase in volume due to temperature change, not a mode of heat transfer.
• Convection: Involves the transfer of heat through the movement of fluids (liquids or gases). Here, there is no fluid movement described.
• Conduction: Occurs when heat is transferred through direct contact between materials. The ice - cream is in direct contact with the warm bowl.
• Radiation: Is the transfer of heat in the form of electromagnetic waves (like the heat from the sun). There is no indication of this in the ice - cream and bowl scenario.

Answer:

conduction