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Why does stainless steel cookware often have a layer of copper or aluminium on the bottom?

Why does stainless steel cookware often have a layer of copper or aluminium on the bottom?

Grade:10

3 Answers

Jitender Pal
askIITians Faculty 365 Points
8 years ago
Energy is transferred by thermal conduction. A substance with large value of thermal conductivity is a good thermal conductor and which has small value of thermal conductivity is a poor thermal conductor. The thermal conductivity of stainless steel is 14 W/m.K, whereas thermal conductivity of aluminum is 235 W/m.K and copper is 401 W/m.K. Since the thermal conductivity of copper or aluminum is greater than the stainless steel. That is why stainless steel cookware often does have layer of copper or aluminum on the bottom.
Jerry
31 Points
one year ago
This is called an "induction base." Stainless steel is a good conductor, but copper and aluminium are better at transferring heat. The copper in the base helps with that.
Jerry
31 Points
one year ago

Stainless Steel is one of the most popular metals for cookware and it has a high resistance to corrosion. With the exception of copper or aluminium, stainless steel does not react with food.

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