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CBSE Class 9 Answered

<div>WHY BOILING IS CONSIDERED A BULK PHENOMENON?</div>
Asked by Asmita | 16 Aug, 2015, 09:11: PM
Expert Answer
The temperature at which liquid changes into its gaseous state is called as boiling point.
During boiling of a liquid, say water or milk, heating is to be done from the bottom of the vessel to bring the temperature of the entire liquid to its boiling point - so it is a bulk phenomenon.
 
But in case of evaporation, the liquid evaporates from the top surface without heating, for example, evaporation of water from the surface of a lake or vesssel. Thus, evaporation is a surface phenomena.
Answered by Prachi Sawant | 17 Aug, 2015, 09:52: AM
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