Question

which of the following is the best example of heat transfer by conduction?
a radiator warming a room.
heat traveling through a metal spoon in a hot bowl of soup.
warm air rising and cool air sinking in a room.
the sun warming your skin on a sunny day.

Explanation:

• Conduction is heat transfer through direct contact of materials.
• A metal spoon in hot soup has direct contact, so heat travels through it by conduction.
• A radiator warming a room is mainly by convection (air movement) and some radiation.
• Warm air rising and cool air sinking is convection.
• The sun warming skin is radiation (electromagnetic waves).

Answer:

Heat traveling through a metal spoon in a hot bowl of soup.