Question

types of heat transfer
part 1: identifying types of heat transfer
for #1 - 12, identify the type(s) of heat transfer in the image/example. some may have more than one.
1.
2.
3.
4.
5.
6.

1. warm air over the beach rises while cooler dense air from the ocean rushes in due to
2. the metal skewer gets so hot that you drop your marshmallow in the campfire because of
3. a huge rock at the state park gets so hot during the day that you can’t sit on it from
4. you lay on that same rock at night so that you can keep warm by
5. a fireman feels a door and it is hot from the fire on the other side due to
6. the cause of weather systems on earth is

Explanation:

1. A toaster uses heating elements that emit infrared (thermal) radiation to toast bread.
2. A hair dryer blows hot air, which transfers heat via the movement of the air (convection).
3. An iron transfers heat directly from its hot metal plate to clothes through contact (conduction).
4. A campfire emits thermal radiation that heats nearby objects/air; it also uses convection (rising hot air) and conduction (direct contact with the fire), but radiation is the primary non-contact heat transfer here.
5. An air conditioner moves cool air through a space, transferring heat via the movement of air (convection).
6. The sun emits thermal radiation that heats the people and sand below.
7. Warm, less dense air rises, and cool, dense air sinks/replaces it—this is the definition of convection currents, which create sea breezes.
8. The metal skewer gets hot because heat moves through the solid metal from the campfire (direct contact with hot coals/flames) via conduction, not radiation.
9. The rock is heated directly by the sun's thermal radiation.
10. When you lay on the warm rock, heat transfers from the rock to your body through direct physical contact (conduction).
11. Heat moves through the solid door material from the fire side to the side the firefighter touches (conduction).
12. Global weather systems are driven by convection currents, caused by uneven heating of the Earth's surface creating rising/sinking air masses.

Answer:

1. Radiation
2. Convection
3. Conduction
4. Radiation (plus convection/conduction)
5. Convection
6. Radiation
7. Convection
8. Conduction
9. Radiation
10. Conduction
11. Conduction
12. Convection