Answered

Select all that apply.


Heat flow due to convection could occur in which of the following?


a lake

the air in a room

the air outside

a cement sidewalk

Verified Answer :

The definition of heat transfer through convection involves the movement of a fluid that causes heat to move away from a hear source. That being said, convection can take place in a lake, air inside, and air outside since both liquids and gasses are considered to be fluids.
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Answer: The correct answers are a lake, the air in a room  and the air outside.

Explanation:

There are 3 modes by which heat can be transferred:

1. Conduction: In this process, heat is transferred whenever there is a direct contact between the two objects.

2. Convection: In this process, the heat is transferred whenever there is a movement of fluid. Fluid can be a liquid or gas.

3. Radiation: In this process, the heat is transferred whenever there is direct transfer of energy through the space.

From the given options,

Heat flow due to convection can occur in a lake, the air in a room and the air outside because, in these hot air rises up after capturing heat energy and cold air being more dense settles down and the process of heating continues.

Hence, the correct answers are a lake, the air in a room  and the air outside.

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