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In which condition is fog formation less likely?

Answer and explanation

Correct answer: Warm dry air and strong mixing

Answer: A, warm dry air and strong mixing. Fog generally develops when air near the ground is moist and cools to saturation. Calm conditions allow cooling and let the moist air remain near the surface, while valleys can collect cold air. Option A produces the opposite situation: warm air can hold more vapour without reaching saturation, dry air has less moisture, and strong mixing prevents a stable, cool layer from remaining near the ground. Therefore fog is less likely. Option B is wrong because cool, moist and calm conditions favour saturation and fog. Option C is wrong because cold-air pooling in a valley commonly promotes cooling and fog formation when moisture is available. Option D is wrong because saturated air near the surface is already at the condition needed for condensation. Memory cue: fog prefers “cool, moist and calm”; warm, dry and mixed air usually clears it or prevents it.

Related tags

FogDry AirWind MixingSaturationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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