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EVAPORATION |
VAPOURIZATION |
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Liquid changes to gaseous phase at temperature below boiling point |
Solid or Liquid changes to gaseous phase at boiling point or below the boiling point . It may be further classified as evaporation and boiling |
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It is a surface phenomenon , only particles at the surface participate in evaporation |
It is a surface phenomenon in case of evaporation and bulk phenomenon in case of boiling where all the particles in the matter participate |
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Evaporation results in lowering of temperature |
The temperature may be lowered or remains constant in vaporization |
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Vapour pressure is lower than external pressure |
Vapour pressure may be lower or same as external pressure in evaporation and boiling respectively |
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Heat source is not required for the process |
A heat source may or may not be required depending on the process |
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