I need the answer soon ,please and very much thank you
2007-01-11 09:06:56 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
This is the answer I gave to a similar question:
While fog and cloud look much the same from inside and fog in mountainous areas is often cloud, fog generally is not cloud on the ground.
The ground cools overnight by radiating into space. The cool ground in turn cools the air above that which in turn cools the air above that. Thus there is a layer of cold air close to the ground. The greatest rate of cooling occurs when there is no cloud and little or no wind.
There is always water vapour in the air. This is the gaseous form of water. The water vapour is condensing into water droplets and the water droplets are evaporating. This goes on all the time. Usually the rate of evaporation exceeds the rate of condensation and the air is clear.
There is a temperature at which the rate of condensation equals the rate of evaporation. This is called the Dew Point. The Dew Point differs for each air mass depending on the amount of water vapour in the air but can be measured easily.
If the temperature falls below the Dew Point, as it could close to the ground in the cool air I spoke of earlier, then the rate of condensation exceeds the rate of evaporation and liquid water condenses out of the air.
On very still mornings, this liquid water deposits itself on the ground, rocks, motor cars etc and we call it dew. If there is a very light wind, the air very close to the ground will be mixed with the air a little higher and the water droplets will stay suspended in the air. We call this suspension of water doplets "fog". Once the sun comes up and the air temperature rises above the Dew Point, the fog evaporates.
2007-01-11 09:19:32 · answer #1 · answered by tentofield 7 · 0⤊ 1⤋
Whenever the air is saturated to 100% fog may form. If different temperature air layers exist, it may form at lower than 100%. It is the visible moisture in the air that is airborne and not yet condensed or evaporated.
2007-01-11 17:15:03 · answer #2 · answered by itsbob1 5 · 0⤊ 0⤋
Fog is basically a cloud near the ground. Water vapor is condensing on dust particles.
2007-01-11 17:12:13 · answer #3 · answered by sparbles 5 · 0⤊ 1⤋
Fog is water that has evaporated.
2007-01-11 17:11:15 · answer #4 · answered by Andrea O. 1 · 0⤊ 1⤋
heat rising
2007-01-11 17:11:18 · answer #5 · answered by ndbt 4 · 0⤊ 1⤋