Question

What causes the air above a pot of boiling water to become warm?

The air transfers thermal energy to the water vapor.
The water vapor transfers thermal energy to the air.
The particles in the air lose kinetic energy.
The particles in the water vapor gain kinetic energy.

PLZZZ

Answer 1

The air above a pot of boiling water becomes warm because

iv. The particles in the water vapour gain kinetic energy.

1. When water is boiled, heat is transfered from the pot to the water by conduction.

2. This heat energy spreads through the mass of water by convection and the water particles gain kinetic energy.

3. These particles are lighter and hence travel upwards.

4. They transfer the energy they possess to the adjoining particles above.

5. Hence the air above the pot feels hot.

Answer 2

The water vapor transfers thermal energy to the air.

Option (B) is correct.

Explanation:

• Heat energy can be transferred from one place to another by three main processes. By convection, heat energy is carried by the movement of particles of matter.
• By conduction, heat is transferred by particles vibrating.
• By radiation, heat is carried directly by electromagnetic waves.
• In this case the water vapours get warm and lift up in the air and transfer the energy to the air. As the air and water vapours come into contact with each other the energy is transferred.
• Thus the water vapor transfers thermal energy to the air.

Also learn more

What is Electromagnetic wave?

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