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Which microscopic particles are required for water vapor to condense in the atmosphere?

Answer and explanation

Correct answer: Condensation nuclei (dust particles)

Direct answer: B, condensation nuclei such as dust particles. Atmospheric air contains water vapour, but tiny suspended particles provide surfaces on which vapour can begin forming liquid droplets or ice crystals. These particles are called condensation nuclei and may include dust, sea-salt particles, smoke or other aerosols. As moist air cools, water molecules gather around these nuclei, allowing clouds and mist to develop. A is wrong because oxygen is a gas in air, not the special surface needed for this process. C is wrong because water molecules are the material that condenses, not the nuclei that support condensation. D is too absolute: condensation can occur without particles under special conditions, but in the atmosphere nuclei make it much easier and are the expected school-level answer. Cue: nuclei are tiny “seeds” around which cloud droplets grow.

Related tags

CondensationCondensation NucleiCloud FormationWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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