Question

What are the significance of melting point and the boiling point of a substance ???

Answer 1

The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts). 
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Answer 2

melting point of a substance tells us the temperature at which a substance starts melting
and boiling point of a substance tells us the temperature at which a substance starts boiling