Spark image
CONDUCTION

Good conductors:
Copper Heating appliances, boilers, (Davy) safety lamps, fire tubes in steam engines, tip of soldering iron
Aluminium Cooking utensils
Iron Shaped into fins to give a large surface area for cooling in air-cooled engines

Bad conductors:
Felt, glass fibre Lining of roofs, lagging to pipes and boilers (i.e. heat insulation)
Asbestos Lining of roofs, lagging to pipes and boilers, protective clothing, radiators
Paper   Wrapping such as fish and chips
Plastic   Handles to cooking utensils
Wood   Handles to cooking utensils, wooden spoons, table mats
Cork   Table mats
Straw   Roofing (thatch), hay-box used in camping
Glass, porcelain Crockery (little heat transfer to hands and lips)
Fat   In the skin and around organs of animals and humans
Bricks, plaster Housing
Air   Woollen clothing (fibres of wool have many air spaces), feathers, fur, eiderdowns, string vests, cellular blankets, cavity walls, double glazing
Vermiculite Insulation

The photo shows some of the insulating tiles on the Apolllo 10 command module.



A VERSION IN WORD IS AVAILABLE ON THE SCHOOLPHYSICS USB
 
 
 
© Keith Gibbs