1. Baseline (Aiming for 4): Relate the
thermal conductivities of a material to the uses of that
material.
Further (Aiming for 6): Describe the
changes in the behaviour of the particles in a material as
the temperature increases
Challenge (Aiming for 8): Explain the different thermal conductivities of materials using the free electron and lattice vibration explanations of conduction.

2. Aiming for 4 Conclusion
Some material have a higher thermal conductivity that others. These materials prevent or reduce the rate of energy transfer through them. The materials are called insulators.

3. Aiming for 6 - 8 Conclusion
The energy transfer per second through a later of insulating material depends on:
The temperature difference across the material.
The thickness of the material.
The thermal conductivity of the material.