What causes the formation of clouds?
2.0 Marks
a) Dust particles which form the nucleus for condensation
b) Deposition of ice on cold surfaces
c) When warm moist air blows over a cold surface
Answers
Answer:
the option c is right answer
Answer:
1. Clouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. For this to happen, the parcel of air must be saturated, i.e. unable to hold all the water it contains in vapor form, so it starts to condense into a liquid or solid form.
a) Almost a century ago it was found that cloud and fog droplets form by condensation of water vapor from the atmosphere on small particles, so-called condensation nuclei.
b) Types of frost include crystalline frost (hoar frost or radiation frost) from deposition of water vapor from air of low humidity, white frost in humid conditions, window frost on glass surfaces, advection frost from cold wind over cold surfaces, black frost without visible ice at low temperatures and very low humidity, ...
c) Advection fog
Advection fog occurs when moist, warm air passes over a colder surface and is cooled. A common example of this is when a warm front passes over an area with snow cover. It is also common at sea when moist tropical air moves over cooler waters.