Conduction, Convection and Radiation

1.        Look at the three descriptions of heat transfer below. One of them describes conduction, one describes convection and the other describes radiation. Match each description to the correct method of heat transfer.

A : heat energy is carried by the material from a hot place to a cold place

B : heat energy travels directly, a material is not required to carry the heat

C : heat energy travels through the material, the material itself does not move

2.        Use the words conduction, conductor, insulator, convection, convector, radiation or radiator to complete each of the following sentences about heat transfer.

i) copper pans are better than steel ones because copper is a better ..................... than steel

ii) Eskimo’s wear fur on the inside because the fur traps air and prevents heat loss by .....................

iii) sheets of newspaper keep fish and chips hot because layers of paper and air are a poor ....................... of heat

iv) igloos are built of snow and not ice because snow is white and prevents heat being absorbed by ........................ . Snow also contains more air than ice and so it is a better ..................... than ice.

v) a shiny metal teapot stays hotter than a dull brown one because a shiny surface is a poor ................... of heat

vi) astronauts should not wear black spacesuits because black would not prevent heat loss by ...................... In direct sunlight a black spacesuit would also absorb more heat by ........................

3.        Look at the diagram of a gas fired central heating system below

a) In the positions marked 1, 2 and 3 on the diagram state whether the main type of heat transfer would be conduction, convection or radiation.

b) suggest two ways of increasing the efficiency of the central heating system

1 ................................................................................................................................................

2 ................................................................................................................................................

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