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Why do water droplets appear outside a cold bottle?

Answer and explanation

Correct answer: Water vapour in the nearby air condenses

Correct answer: A. The air around the bottle contains invisible water vapour. The cold bottle cools the thin layer of nearby air. If that air reaches its dew point, it can no longer retain all the vapour in gaseous form, so some vapour changes into liquid droplets on the outside surface. This process is condensation. B is usually wrong because the droplets form from surrounding air, even when the bottle is sealed. C is wrong because glass does not manufacture water. D is wrong because the bottle cools nearby air rather than heating it. A useful check is to wipe the outside: the droplets return while the surface remains cold. Memory cue: outside a cold container means moisture from the air, not leakage from inside.

Related tags

GeographyCondensationDew PointCold BottleHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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