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When water vapour cools at high altitude, which energy absorbed during evaporation is released to the atmosphere during condensation?

Answer and explanation

Correct answer: Latent heat of vaporisation

Correct answer: B, the latent heat of vaporisation. During evaporation, liquid water absorbs energy from the surroundings. This energy is used to separate water molecules and change their state from liquid to vapour; it is stored as latent heat rather than appearing mainly as a temperature rise. Winds can carry the vapour upward and across regions. When the vapour cools and condenses into liquid droplets in clouds, the reverse phase change releases the stored latent heat to the surrounding air. That released heat can influence convection and atmospheric circulation. A, kinetic energy, is associated with molecular motion, but it is not the specific stored phase-change energy asked for. C, nuclear energy, comes from changes in atomic nuclei and is unrelated to ordinary evaporation and condensation. D, chemical energy, is stored in chemical bonds and is not the energy transferred in this phase change. Memory cue: evaporation absorbs latent heat; condensation releases the same latent heat.

Related tags

Latent HeatEvaporationCondensationAtmospheric EnergyHydrological CycleThe Living WorldBiologyClass 11 Mcq

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