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How can salinity indirectly affect evaporation from a sea surface?

Answer and explanation

Correct answer: Salinity can slightly reduce the vapour pressure of water

Correct answer: A. Sea water contains dissolved salts, so it is not chemically identical to pure water. Dissolved salt lowers the escaping tendency of water molecules and slightly lowers the vapour pressure of the solution compared with pure water at the same temperature. Because vapour pressure is one factor controlling the movement of water molecules into the air, salinity can slightly reduce evaporation under otherwise similar conditions. It does not stop evaporation. Temperature, wind, humidity, exposed surface area, and available energy usually have much larger practical effects. B is meaningless and scientifically incorrect. C is wrong because salts do not eliminate incoming solar energy. D is an absolute statement and is false: salty water still changes into vapour. Memory cue: “Salt lowers the rate a little; it does not cancel evaporation.”

Related tags

SalinityEvaporationVapour PressureHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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