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For condensation, what must be present in air?

Answer and explanation

Correct answer: Water vapour

Condensation is the process in which water vapour changes into liquid water, or sometimes ice, after cooling or reaching a suitable condition. Therefore, water vapour must be present before condensation can occur. Cooling alone cannot create water droplets if there is no moisture in the air. The vapour may condense on a surface or around tiny particles in the atmosphere and form droplets, fog, clouds, or dew. Dust and smoke can sometimes act as surfaces, but they are not the essential substance being changed.

Option D is correct because water vapour is the material that undergoes condensation. Nitrogen is a major atmospheric gas, but it does not become water droplets in this process. Dust and smoke may assist droplet formation under some conditions, yet condensation can be discussed through the necessary presence of moisture, not their compulsory presence. Thus, the most fundamental requirement listed is water vapour in the air.

Related tags

CondensationWater VapourAir

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