Question

Why eggs become solid on boiling in place of converting onto liquid?

Answer 1

Because the albumin inside it is protein which gets converted into solid mass.

Answer 2

Eggs are rich in protein, especially the egg whites. It's this protein that causes eggs to become hard when boiled. Here's how it works:Protein is a chain of amino acids. These amino-acid strings fold back on themselves (the way the strings fold determines the protein's chemical and biological properties). The proteins are held in place by weak bonds (non-covalent) between different parts of the amino-acid string. When you break those strings, by various methods, you are denaturing the protein.
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