Why do eggs turn solid when you cook them?

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Conventional chemistry wisdom says that something which starts out as a liquid should either remain liquid or evaporate when heat is applied. Why do eggs go in the opposite direction?

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13 Answers

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Cooking means that a chemical reaction is happening. Chemical reactions dont go back when you change the temperature. Cooked eggs are like a baked cake or a fried potato; they can’t be simply cooled down to reverse the cooking.

Some liquids do boil when you heat them enough, especially chemically simple ones. However most complex organic liquids like egg white, milk, or aquafaba will cook before they boil.

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