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By which process does water vapour change into liquid droplets?

Answer and explanation

Correct answer: Condensation

Answer: B, condensation. Water can exist as ice, liquid water, or water vapour. When water vapour loses heat and the air reaches a suitable condition, the molecules come closer together and form tiny liquid droplets. This change from gas to liquid is called condensation. It is an important step in cloud formation: rising moist air cools, vapour condenses on tiny particles, and droplets collect in the cloud. B is therefore correct. A, evaporation, is the opposite change: liquid water gains energy and becomes water vapour. C, salinity, means the amount of dissolved salt in water and is not a change of state. D, erosion, is the wearing away and movement of soil or rock by water, wind, ice, or other agents. Memory cue: evaporation goes liquid to gas; condensation goes gas to liquid.

Related tags

CondensationWater VapourLiquid DropletsCloud FormationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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