Question

read each description below and classify it according to how heat is being transferred.
an egg begins to cook as it makes contact with a hot frying pan.
select
a hot air balloon rises as fire heats the air inside the balloon.
select
a warm can of soda begins to cool when it is placed in a bucket of ice.
select
a boy’s shirt becomes warmer as he stands outside on a sunny day.
select
a girl’s bare foot feels cold as she steps onto ceramic tile.
select
a heater blows hot air to warm a room on a cold winter day.
select

Explanation:

To solve this, we identify the heat transfer method (conduction, convection, radiation) for each scenario:

1. An egg begins to cook as it makes contact with a hot frying pan.

• Explanation: Heat transfer through direct contact (solid - solid or solid - liquid contact) is conduction. The egg and frying pan are in direct contact, so heat moves from the pan to the egg via conduction.
• Answer: Conduction

2. A hot air balloon rises as fire heats the air inside the balloon.

• Explanation: Heating air causes it to expand (become less dense) and rise, while cooler air sinks. This movement of fluid (air) carrying heat is convection. The fire heats the air (fluid), and the heated air moves, transferring heat.
• Answer: Convection

3. A warm can of soda begins to cool when it is placed in a bucket of ice.

• Explanation: The warm can and cold ice are in contact (the can is in the ice - water or near ice, with heat moving between them through direct contact). This is conduction (heat transfer between objects in contact, with the can losing heat to the ice).
• Answer: Conduction

4. A boy’s shirt becomes warmer as he stands outside on a sunny day.

• Explanation: Heat from the sun travels through empty space (vacuum of space to Earth’s atmosphere) via electromagnetic waves. This type of heat transfer without a medium (or through air with no direct contact) is radiation. The sun’s heat reaches the boy’s shirt via radiation.
• Answer: Radiation

5. A girl’s bare foot feels cold as she steps onto ceramic tile.

• Explanation: The girl’s foot and the ceramic tile are in direct contact. Heat moves from her foot (warmer) to the tile (cooler) through direct contact, which is conduction.
• Answer: Conduction

6. A heater blows hot air to warm a room on a cold winter day.

• Explanation: The heater warms the air, and the warm air moves (blows) around the room, transferring heat. This movement of heated fluid (air) is convection.
• Answer: Convection

Answer:

To solve this, we identify the heat transfer method (conduction, convection, radiation) for each scenario:

1. An egg begins to cook as it makes contact with a hot frying pan.

• Explanation: Heat transfer through direct contact (solid - solid or solid - liquid contact) is conduction. The egg and frying pan are in direct contact, so heat moves from the pan to the egg via conduction.
• Answer: Conduction

2. A hot air balloon rises as fire heats the air inside the balloon.

• Explanation: Heating air causes it to expand (become less dense) and rise, while cooler air sinks. This movement of fluid (air) carrying heat is convection. The fire heats the air (fluid), and the heated air moves, transferring heat.
• Answer: Convection

3. A warm can of soda begins to cool when it is placed in a bucket of ice.

• Explanation: The warm can and cold ice are in contact (the can is in the ice - water or near ice, with heat moving between them through direct contact). This is conduction (heat transfer between objects in contact, with the can losing heat to the ice).
• Answer: Conduction

4. A boy’s shirt becomes warmer as he stands outside on a sunny day.

• Explanation: Heat from the sun travels through empty space (vacuum of space to Earth’s atmosphere) via electromagnetic waves. This type of heat transfer without a medium (or through air with no direct contact) is radiation. The sun’s heat reaches the boy’s shirt via radiation.
• Answer: Radiation

5. A girl’s bare foot feels cold as she steps onto ceramic tile.

• Explanation: The girl’s foot and the ceramic tile are in direct contact. Heat moves from her foot (warmer) to the tile (cooler) through direct contact, which is conduction.
• Answer: Conduction

6. A heater blows hot air to warm a room on a cold winter day.

• Explanation: The heater warms the air, and the warm air moves (blows) around the room, transferring heat. This movement of heated fluid (air) is convection.
• Answer: Convection