Sara wanted to find out how well house insulation works. She made models of two houses – one that was insulated, and one that was not insulated. She used a cardboard box as a house and a sealed container of hot water as a heater.
This diagram shows a cross section of Sara's insulated house.
| a) |
How would the walls be different in Sara's non-insulated house?
|
|
| b) |
To make her investigation a "fair test", what are three things Sara would need to keep the same? |
|
|
i)
ii)
iii)
|
|
|
| c) |
Why do people use house insulation?
|
|