Why will dew not form if the surface remains warmer than the dew point?
Answer and explanation
Correct answer: Because the air near the surface will not reach saturation
Dew forms when air in contact with a surface cools to its dew point, becomes saturated, and water vapour condenses into tiny liquid droplets. If the surface remains warmer than the dew point, the nearby air does not become saturated, so condensation and dew formation do not occur. Ice-crystal formation refers to frost, not dew. Exam tip: dew requires the surface temperature to fall to or below the dew point.
Frequently asked questions
What is the correct answer to this question?
Because the air near the surface will not reach saturation
Why is this the correct answer?
Dew forms when air in contact with a surface cools to its dew point, becomes saturated, and water vapour condenses into tiny liquid droplets. If the surface remains warmer than the dew point, the nearby air does not become saturated, so condensation and dew formation do not occur. Ice-crystal formation refers to frost, not dew. Exam tip: dew requires the surface temperature to fall to or below 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.
