Question

(iv) Explain how dew and fog are formed.
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Answer 1

Answer:

Calm winds lead to the formation of dew. The surface of air at ground level is colder than the air above the surface. Radiation cooling lead to the temperature drops to the condensation level and then dew forms. When the air above the ground cools under light wind speeds, fog also forms

Answer 2

Explanation:

Fog is formed when there is a difference of less than 2.5 °C between the air temperature and the dew point, which is the temperature below which water droplets start to condense and form dew. When water vapor condenses, it turns into tiny droplets of water that are suspended in the air. Water vapor exists in the atmosphere for various reasons, including the evaporation of water from water bodies, transpiration from plant leaves, and the movement of air over warm bodies of water.