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This diagram shows a cube of some unspecified building material. It is seen looking slightly downwards on a top corner. Three labelled arrows indicate that each side is one metre long. An arrow across the top face is labelled ‘1 K temperature difference’. Running parallel to this arrow but penetrating the cube is a broader red arrow pointing to the left which is labelled ‘heat flow, watts’.

 2.2.3 Insulation materials and their properties