when I keep a very cold bottle in a room temperature. and after 1 hour I see water vapours. why?
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Answer:
it is because when cold water bottle came in contact with the water vapour presents in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.
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Answer:
This water comes from the surrounding air humidity. The water in the air in vapour phase touches the cold outside furface of the bottle and reaches its dew point.this means that the molecules of water loose energy which is transferred to the bottle body and as a result the intermolecular attraction forces of the vapour phase water in the airair, prevail and force the molecules of the vapour to come closer and form liquid water. so this liquefied vapour accumulates gradually on the outer surface forming a thick layer firstly and later water droplets Start to fall down.
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