Question

why liquids have different boiling and melting points despite of the fact that they have similar phase?

Answer 1

As we learned in solids, liquids, and gases all matter exists in certain states or phases. Water can be liquid water, solid ice, or gas vapor. It's still all water, however, and made up of molecules of 2 hydrogen atoms and 1 oxygen atom (H2O).

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Answer 2

Question :-

why liquids have different boiling and melting points despite of the fact that they have similar phase?

Answer :-

Intermolecular forces determine bulk properties such as the melting points of solids and the boiling points of liquids. Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid.