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When can fog become denser?

Answer and explanation

Correct answer: When lower air is closer to saturation

Correct answer: C. Fog consists of suspended water droplets in the air near the ground. When the lower air contains abundant moisture and is cooled close to its dew point, it approaches saturation. A small further cooling, or the presence of suitable condensation nuclei, can then produce more droplets. A greater concentration of droplets scatters more light and usually makes the fog look denser and visibility poorer. C is correct because air near saturation is in the most favourable condition for additional condensation. A is wrong because hot, dry air is generally unfavourable for fog. B is wrong because fog requires water vapour or moisture. D is wrong because burning ground is not a normal requirement and intense heating would generally discourage condensation. The exact density also depends on droplet concentration, air movement and local conditions. Memory cue: dense fog needs moist lower air, cooling and near-saturation.

Related tags

Dense FogSaturationMoistureVisibilityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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