what causes fog?

Answer 1

i think fog is caused because of the humidity in the air, and when it gets cooler, the fog apears

Answer 2

Well, you need to be more specific. There are several kinds of fog. If you are talking about ground fog, several things cause it
1) The temperature and the dewpoint have to be the same
2) That means the humidity has to be 100 percent
3) You have to have no wind
4) You have to have moisture
If you are talking about steam fog
1) The water temp has to be way warmer than the air temp, causing steam to rise off the water. This usually occurs in early december

Answer 3

Most types of fog form when the relative humidity reaches 100% at ground-level. Fog can form suddenly, and can dissipate just as rapidly, depending what side of the dewpoint the temperature is on.

Most types of fog form when the relative humidity reaches 100% at ground-level. Fog can form suddenly, and can dissipate just as rapidly, depending what side of the dewpoint the temperature is on.

Fog can form in a number of ways, depending on how the cooling that caused the condensation occurred:

Radiation fog is formed by the cooling of land after sunset by thermal (infrared) radiation in calm conditions with clear sky. The cool ground produces condensation in the nearby air by heat conduction. In perfect calm the fog layer can be less than a metre deep but turbulence can promote a thicker layer. Radiation fog is common in autumn and usually does not last long past sunrise.

Ground fog is fog that obscures less than 60% of the sky and does not extend to the base of any overhead clouds. However, the term is sometimes used to refer to radiation fog.

An important exception to the general rule is sea fog. This is due to the peculiar effect of salt. Clouds of all types require minute hygroscopic particles upon which water vapor can condense. Over the ocean surface, the most common particles are salt from salt spray produced by breaking waves. Except in areas of storminess, the most common areas of breaking waves are located near coastlines, hence the greatest densities of airborne salt particles are there. Condensation on salt particles has been observed to occur at humidities as low as 70%, thus fog can occur even in relatively dry air in suitable locations such as the California coast. Typically, such lower humidity fog is preceded by a transparent mistiness along the coastline as condensation competes with evaporation, a phenomenon that is typically noticeable by beachgoers in the afternoon.

Answer 4

The clouds just get lower and lower to the ground making fog. Or if you want to make your own fog use dry ice and water

Answer 5

Fog is a cloud that is sitting on the ground! It's just a really low cloud. So what you really need to ask, is "What Causes clouds?"

Answer 6

der r two imp thngs
-> humidity
-> dec in temperature near abt 5 deg or less

this will cause fog in winters!!!