thermal conductivity

Question 1

what is thermal conductivity

Answer 1

thermal conductivity is a measure of how well a material conducts energy when heated

Question 2

what is the required practical thermal conductivity

Answer 2

1. boil kettle, poor 25cm^2 of boiling water into a metal can
2. wrap two layers of newspaper around the metal can
3. use thermometer to record starting temp and use stopwatch to time 5 mins
4. use thermometer to record temp at end
5. workout temp change and repeat with different layers of newspaper