An oven is made of double walls and the space between them is filled with wool, cork etc. The wool and cork are the insulators of heat. They prevent the heat of the oven to escape. Cooking utensils and pans are made of metals such as copper, brass, steel etc. The reason is that the metals are conductors of heat and so they heat up rapidly. Cookin . . .
Conductors: The substances which allow heat to pass through them easily are called the conductors of heat. For example: Silver, copper, iron, aluminum and mercury are conductors of heat. The substance like glass, stone, marble and slate do not conduct heat easily as metal do. These substances are not as good conductors of heat as the metals are. . . .