Question

How many ways can you see that heat can transfer from the inside to the outside of your room on a cold day? List at least three and describe in detail how heat moves through the different kinds of materials (glass, brick, wood, insulation, etc.)—by conduction, convection or radiation. Which process do you suppose dominates?

Answer 1

The heat transfer on cold days from inside to outside of room take place by three ways-

Conduction-Conduction is the method of transfer of heat within a body or from one body to the other due to the transfer of heat by molecules vibrating at their mean positions. The bodies are in actual contact with each other.

Convection-Convection is the mode of heat transfer which occurs mostly in liquids and gases.In this method, heat transfer takes place with the actual motion of matter from one place within the body to the other.

Radiation-It does not require any material medium for transfer of heat. Thus can happen in vacuum too. basically,heat transfer takes place through electromagnetic waves.

The material and heat transfer-

Brick- Conduction and Radiation

Glass- Conduction and Radiation

Wood- Conduction and Radiation

Insulation- Conduction and Radiation

Among all three above,radiation process dominates as it does not require material medium for heat transfer.