Good morning everyone present here, today I am going to give a speech on fog. Fog is a specific kind of thin cloud made up of little water droplets suspended in the air close to the ground, which reduces horizontal visibility. Fog is described by Byers as “nearly microscopically small water drops floating in the atmosphere and decreasing the horizontal visibility to less than one kilometer.” It should be noted that while fogs are created by the radiation, conduction, and mixing of warm and cold air masses close to the surface of the earth, clouds are created by the ascent, expansion, and cooling of air.
When the moist air (with a relative humidity of over 97%) becomes saturated, reaches its dew point, and then cools further, water vapor condenses around dust, smoke, and other airborne contaminants to form tiny water droplets that are suspended in the air due to their extreme lightness.
These extremely little water droplets condense into smoky clouds that move with the wind. When the fog is particularly thick, there is complete darkness, and visibility increases. When visibility is limited to two kilometers, there is a light fog, also referred to as mist.
Fog often appears in the morning but can occasionally last until midday and is associated with a temperature inversion. In subtropical areas, fog is most common in the winter, but it can be found in all seasons above 35° latitude. Fog typically has a whitish color, but because of the mixing of smoke, dust, and fly ash over large cities and industrial areas, it appears dirty yellow or gray. Thank you.