What is the purpose of a layer or copper or aluminum on the bottom of stainless steel cookware?

All objects continuously emit radiant energy. Why then doesn't the temperature of all objects continuously decrease?

All objects continuously absorb energy from their surroundings. Why then doesn't the temperature of all objects continuously increase?

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  1. Stainless steel is a poor conductor of heat. To spread the heat evenly across the bottom, another metal is needed.

    On the second, they do. The universe is cooling.

    On the third, the temperature stablizes when thermal radiation radiating is equal to thermal radiation coming in.

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