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Geography

Forms of condensation: dew, frost, fog, and mist

This Class 12 Geography topic from “Water in the Atmosphere” explains how water vapour changes into visible forms near Earth’s surface. Students learn how cooling, the dew point, relative humidity, and the availability of condensation nuclei produce dew, frost, fog, and mist. The topic distinguishes these forms by temperature, physical state, visibility, and formation conditions, including the role of surface cooling, calm air, and suspended droplets or ice crystals. It also helps students understand their effects on weather, visibility, agriculture, and daily life.

Expert · Level 1 · 7 questions

Practice questions

01Why can two unsaturated air masses sometimes form fog after mixing?

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02In cold, high clouds, which process can increase precipitation through ice-crystal growth?

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03If on a clear night the surface reaches dew point but water vapour in air is very low what will happen to dew formation?

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04Dew on low grass but not on a higher dry twig in the same field can be explained by what?

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05What is the deeper location-based difference between dew and fog?

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06What is the most accurate physical difference between dew and frost?

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07If dew is on the surface but the air is clear what is the best conclusion?

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