Wood/Metal Cylinder

The wood/metal cylinder offers a nice demonstration of conduction and insulation. The apparatus consists of a copper tube attached to a wooden rod of equal diameter. A piece of paper is wrapped tightly around the central section, covering the wood and metal parts, then the rod/cylinder is passed through a Bunsen burner flame for few seconds, making sure both wood and metal parts pass through the flame. The metal part conducts heat away so the paper hardly browns, but because the wood part is an insulator the paper covering gets scorched by the flame. Dimensions (L x Dia.): 190 x 22 mm.