Question

write conduction, convection, or radiation on the line next to the statements. choose the best answer.

1. you are stirring a bowl of hot soup with a metal spoon. the spoon starts to feel warmer because of
2. you buy a lava lamp from the store. as the lamp heats up, blobs of liquid rise to the top then sink back down to the bottom. this process continues because of
3. you are doing your homework at a desk that is underneath a lamp. you start to feel hotter because of
4. your best friend has a bunk bed. you move from the bottom bunk to the top bunk and notice that the air is warmer. the warm air rises because of
5. you are in science class and want to see if the hot plates were used recently. you place your hand over the hot plate. without touching the hot plate, your hand feels warmer. heat is transferred to your hand by
6. you are roasting marshmallows at a campfire. the metal skewer (stick) that youre cooking your marshmallow on burns your hand because of

Explanation:

Step1: Identify heat - transfer methods

Conduction is the transfer of heat through direct contact. Convection is the transfer of heat by the movement of a fluid (liquid or gas). Radiation is the transfer of heat through electromagnetic waves without the need for a medium.

Step2: Analyze each situation

1. Stirring a bowl of hot soup with a metal spoon: The spoon heats up because of conduction as heat is transferred from the hot soup (a warmer object) to the metal spoon (a cooler object) through direct contact.
2. A lava lamp: As the lamp heats up, blobs of liquid rise to the top then sink back down. This is convection. The heated liquid becomes less dense and rises, and the cooler, denser liquid sinks, creating a convective current.
3. Sitting under a lamp and feeling warmer: This is radiation. The lamp emits infrared radiation (a form of electromagnetic radiation) which is absorbed by your body, making you feel warmer.
4. Warm air rising from the bottom bunk to the top bunk: This is convection. The warm air (a fluid) rises because it is less dense than the cooler air around it.
5. Feeling warmth from a hot plate without touching it: This is radiation. The hot plate emits infrared radiation which travels through the air and is absorbed by your hand, making it feel warmer.
6. Roasting marshmallows over a camp - fire: The metal skewer heats up by conduction as it is in direct contact with the heat source (the fire). Your hand feels warm from the skewer by conduction as well, since heat is transferred from the hot skewer to your hand through direct contact.

Answer:

1. Conduction
2. Convection
3. Radiation
4. Convection
5. Radiation
6. Conduction