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Question 1

Define a conductor

Answer 1

A material with a high thermal conductivity (it’s good at transferring heat).

Question 2

Define an insulator

Answer 2

A material with a low thermal conductivity (it’s bad at transferring heat).

Question 3

Define conduction

Answer 3

The transfer of energy through a material by the vibration of its atoms.

Question 4

Define convection

Answer 4

The circulation of a fluid caused by increasing its thermal energy.

Question 5

Define specific heat capacity

Answer 5

The amount of energy needed to raise the temperature of a 1kg substance by 1 °C.

Question 6

Describe how loft insulation reduces heat loss

Answer 6

Made from fiberglass which has a low thermal conductivity. The material is mainly air

Question 7

Describe how cavity wall insulation reduces heat loss

Answer 7

Made from insulating foam. Contains air pockets to stop conduction.

Question 8

Describe how double glazing reduces heat loss

Answer 8

Vacuum between two panes of glass. Reduces conduction and convection.

Question 9

Describe how aluminium foil behind a radiator reduces heat loss

Answer 9

Shiny surface reflects heat back into the room.

Question 10

Give factors that affect how quickly a substance heats up

Answer 10

Mass, thermal energy applied, specific heat capacity