Thermal conductivity Flashcards
Finish the sentence: The higher the thermal conductivity if a material, the higher the
The higher the thermal conductivity of a material, the higher the rate of energy transfer across it
Do metals have the highest or lowest thermal conductivity?
The highest
Do non-metals like wool and fibre-glass have the lowest or highest thermal conducitivty?
The lowest (they are the best insulators)
What are cavity walls?
An inner and outer wall with a gap in the middle
What does the gap in cavity walls do?
It reduces the amount of energy transferred by conduction
What does cavity wall convection do?
Reduce the energy transfer by convection in the wall cavity
What is loft insulation?
Fibreglass wool is laid out across the loft floor and ceiling
What does loft insulation do?
It reduces energy loss by conduction and also helps convection currents from being created
What are double-glazed windows?
There are two sheets of glass with an air gap in between them
What do double-glazed windows do?
They prevent energy transfer by conduction through the windows
Where are draught excluders found?
Doors and windows
What do draught excluders do?
Reduce energy transfers by convection
