What is the fog?
Fog, also known as mist is a meteorological phenomenon that consists of the formation of very low clouds, in contact with the ground or at low altitude.
These clouds are formed by innumerable drops of water so tiny that they can remain in suspension. Fog is formed by evaporation of moisture from the soil.
This causes the rise of moist air, which, upon coming in contact with cold air currents, condenses it, resulting in the appearance of these low clouds.
For this reason the fog produces a considerable sensation of cold and humidity and sometimes gets wet.
It is another of the phenomena produced by the condensation of atmospheric water vapor. In fact, it is a cloud so low it touches the ground.
Both the fog and the cloud consist of a set of droplets scattered in the air. The differences between the two formations are the altitude at which each originates, and that the clouds contain ice crystals.
The fog, therefore, is constituted by droplets of water so microscopic that they float in the air, reducing the visibility so much more together they are thicker is the same.
The fog is formed by cooling the air that is in contact with the earth or the sea.
Like clouds, a mass of warm, moist air is cooled to reach the dew point, ie at the temperature in which it is saturated, excess vapor is condensed in water droplets thanks to the condensation nuclei.
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Types of fog
It is called “mist” when it less affects the visibility and “mist” when the humidity is less than 80 percent, so it is said that the particles suspended in the atmosphere are not water, such as fog or mist, But dust. As for Id Calima, it is a finer mist.
The fog by advection, in this type of fog, the mass of air moves of a hot surface towards one more colder, with which its temperature decreases.
Marine mists are usually formed by this procedure, and appear when a mass of warm, moist air meets and crosses a cold stream.
The air suffers, then, a sudden cooling, reaching the dew point, and the water vapor that it contains condenses on the condensation nuclei, particles of salt in this case.
Tropical fog, which is the most common type on the high seas, originates from a progressive cooling of humid air from the tropics as it moves toward less-warm latitudes.