Energy is transmitted by conduction, convection or radiation.The conductivity of materials can be compared by examining the time taken to transmit energy through them.
What is a thermal conductor?
A material that easily allows thermal energy through
A material that will not allow thermal energy through
A material with a low conductivity
Which is the best insulator?
Why is loft insulation so effective?
It traps air which helps to reduce heat lost from the home
It is itchy but reduces noise in the loft
The fibres do not burn easily if there is a fire
What would make the best material for wrapping around a mug to keep a hot drink warm for as long as possible?
What happens to the molecules in a liquid as it gets hotter?
Stay at the same speed
What happens to the molecules in a solid as it gets hotter?
How much energy will it take to raise 3 kg of water by 5˚C? (water has a specific heat capacity of 4,200 J/kg˚C)
How much energy will a 30 W heater provide in 5 minutes?
When doing an experiment to find the specific heat capacity, which of these items of equipment is not needed?
A force meter
If the same amount of heat energy were to be provided to a block of twice the mass of the same material, what would happen to the temperature rise?
It would be double
It would be the same
It would be half