When air is saturated and temperature falls further, which process is most likely?

Correct answer: Condensation

Correct answer: B, condensation. Saturated air already contains nearly the maximum water vapour possible at its current temperature. When temperature falls further, the air’s capacity to hold water vapour decreases. If the existing vapour amount cannot remain entirely gaseous, some vapour changes into liquid droplets or ice crystals; this is condensation. Depending on where and how it occurs, it can help produce dew, fog, clouds, or precipitation. A is wrong because evaporation changes liquid water into vapour and is generally favoured by warmth and unsaturated air, not by cooling saturated air. C, salinization, is the accumulation of salts in soil or water and is unrelated to this atmospheric change. D, friction, is resistance between moving surfaces and does not describe vapour changing state. The key sequence is: saturation, cooling, reduced holding capacity, then condensation. Memory cue: “saturated plus cooling gives condensation.”