Question

State two ways in which BOILING differs from evaporation.

Answer 1

There are two types of vaporization: evaporation and boiling. Evaporation is a phase transition from the liquid phase to vapor (a state of substance below critical temperature and critical pressure) that occurs at temperatures below the boiling temperature at a given pressure. Evaporation usually occurs on the surface.

Evaporation is a free surface process. Boilingis an entire bulk process that gets triggered from the solid interfaces and phase change occurs at the free surfaces. Boiling happens at a given temperature when the saturation vapour pressure of the liquid equals the atmospheric pressure.

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Answer 2

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BOILING :-

1) It is a process in which a substance changes its state from liquid to the gaseous state.

2) It occurs at a definite temprature (Boiling Point).



EVAPORATION :-

1) It is a process in which a substance changes its state from liquid to gaseous state without boiling .

2) It occurs at all tempratures.


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