Why is the chance of clouds and rain higher in a low-pressure area?
Answer and explanation
Correct answer: Air rises and cools
A low-pressure area usually causes air near the surface to converge and rise. As the air rises, surrounding pressure decreases, so the air expands and cools adiabatically. Cooling lowers its capacity to hold water vapour; when saturation is reached, condensation forms cloud droplets or ice crystals. Further growth of these particles can produce precipitation, although rainfall is not guaranteed in every low-pressure area.
Frequently asked questions
What is the correct answer to this question?
Air rises and cools
Why is this the correct answer?
A low-pressure area usually causes air near the surface to converge and rise. As the air rises, surrounding pressure decreases, so the air expands and cools adiabatically. Cooling lowers its capacity to hold water vapour; when saturation is reached, condensation forms cloud droplets or ice crystals. Further growth of these particles can produce precipitation, although rainfall is not guaranteed in every low-pressure area.
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.
