Why is dew formation difficult if air is very dry?
Answer and explanation
Correct answer: Because dry air lacks sufficient water vapour
Dew forms when a surface cools the nearby air to its dew point, causing the water vapour present in the air to condense into tiny droplets. Very dry air contains little water vapour and usually has a low dew point, so dew is less likely to form even when the surface cools. Option B is incorrect because dry air has a lower, not higher, dew point. Exam tip: dew requires sufficient water vapour and cooling of a surface to the dew point.
Frequently asked questions
What is the correct answer to this question?
Because dry air lacks sufficient water vapour
Why is this the correct answer?
Dew forms when a surface cools the nearby air to its dew point, causing the water vapour present in the air to condense into tiny droplets. Very dry air contains little water vapour and usually has a low dew point, so dew is less likely to form even when the surface cools. Option B is incorrect because dry air has a lower, not higher, dew point. Exam tip: dew requires sufficient water vapour and cooling of a surface to the dew point.
Which subject and chapter does this question cover?
This is a Class 12 Geography question. Chapter: Water in the Atmosphere. Topic: Forms of condensation: dew, frost, fog, and mist.
