Question

While cooking, if the bottom of the vessel is getting blackened on the outside its means that?

Answer 1

it means that the fuel is not burnt completely due to deficiency of oxygen

Answer 2

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While cooking, if the bottom of the vessel is getting blackened on the outside, it means that the fuel is not burning completely. When the fuel burns completely giving a blue flame, the bottom of the vessel remains clean.

When the fuel does not burn completely then a sooty flame appears which makes the bottom of the utensil black. It is due to the air holes, which are getting blocked and the fuel does not burn completely.