20 Physics -- Rate of Heat Flow

Cooking utensils are blackened at the bottom and polished on the upper surface. Explain , why ? 

Cooking utensils are blackened at the bottom and polished on the upper surface. Explain , why ? 

The blackening of the bottom surface of cooking utensils is due to the deposition of soot and carbon from incomplete combustion, while the upper surface remains cleaner due to less exposure to direct heat and combustion by-products.

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