Formation of Fog

Fog is a collection of water droplets are so small that hovered in the air. Fog like cloud, except that the cloud did not touch the surface of the earth, while the fog touches the surface of the earth.
Fog is formed from water vapor from the moist soil, plants, rivers, lakes, and oceans. Water vapor is evolved and become cold when it goes up into the air. Water vapor the air can hold only a certain amount at a specific temperature. Air at a temperature of 30 º C can contain water vapor sebangyak 30 g per m³ of water vapor, the air contains the maximum amount of water vapor that can be withheld. The same volume at a temperature of 20 º C air can only hold 17 grams of water vapor. As much as that can be withheld at that temperature. Air containing water vapor which can contain as much as called the saturated air.
When the air temperature falls and the amount of water vapor through the maximum amount of water vapor that air can hold, then some water vapor begins to turn into dew. The fog will disappear when the air temperature increases and the ability of air to hold water vapor increases. According to the internationally recognized term, the fog is the dew that interfere with vision to less than 1 Km.
There are four types of fog;1. Advection Fog2. Frontal Fog3. Fog Radisi4. Fog Mountain
Advection fog is a fog formed by the air flow through a surface that has a different temperature. One example of this is the fog sea fog which occurs when warm moist air flows over a cold surface. Sea fog often appears along the coast and on the edges of the lake.
One of the other types of fog Advection fog is called Steam. The mist is formed from the flow of cold air through the warm water. Water vapor from the evaporation of water surface continuously, met with cold air. When the air reaches saturation point, then the excess water vapor quickly condenses into fog coming from the evaporation of surface water. Steam fog often appears when the cold air blowing over a large lake and blowing over the warm lake.
Frontal fog is formed through a meeting between two different air temperature period. Fog is formed when rain falls from the warm air into the cold air where moisture evaporates. Thus will lead to moisture on the cold air beyond the saturation point.
Radisi fog formed at night is quiet and clean, when the ground radiates heat back into the air. One layer of fog formed across the surface of the soil, and gradually grows to thick. Radiation fog often appears in the valleys are deep.
Mountain Fog forms when water vapor moves upwards through the mountain slopes. Cold air moves upward slope until unable to hold moisture. The dots fog then formed along the mountainside.