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Define boiling point, melting point and evaporation ?

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Boiling Point : The temperature at which a liquid boils to form vapours at atmospheric pressure is called its boiling point. Boiling point of water is 373 K (100º C + 273 = 373 K).

Melting Point : The temperature at which a solid melts to form liquid at atmospheric pressure is called its melting point. Melting point of ice is 273.16 K (0º C).

Evaporation : A surface phenomenon in which liquid changes into vapours at any temperature below its boiling point is called evaporation. Particles on the surface of a liquid have higher kinetic energy than others, so they break. The forces of attraction between the particles & escape from the surface of liquid in the form of vapours.

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