Which process can begin due to radiational cooling of the ground at night?
Answer and explanation
Correct answer: Condensation, which may form dew or fog
At night, the ground loses heat by radiation and cools the air in contact with it. If this air reaches its dew point, water vapour begins to condense, producing dew or, under suitable conditions, fog. Evaporation generally requires heat, so it is not the direct result of nocturnal radiational cooling. Exam tip: cooling to the dew point indicates condensation.
Frequently asked questions
What is the correct answer to this question?
Condensation, which may form dew or fog
Why is this the correct answer?
At night, the ground loses heat by radiation and cools the air in contact with it. If this air reaches its dew point, water vapour begins to condense, producing dew or, under suitable conditions, fog. Evaporation generally requires heat, so it is not the direct result of nocturnal radiational cooling. Exam tip: cooling to the dew point indicates condensation.
Which subject and chapter does this question cover?
This is a Class 12 Geography question. Chapter: Water in the Atmosphere. Topic: Humidity, evaporation, and condensation.
