What Is Fog And How Is It Formed?

What Is Fog And How Is It Formed

What is fog and how is it formed?. Simply put, fog is nothing more than clouds that hover near the surface of the Earth. In order for them to form, the air must become cooler or more humid. When the water vapor in the air reaches a critical point, the vapor will begin to condense. The resulting water droplets reflect light and cover the land. This visible vapor can be described as ‘fog’, as it reduces visibility to less than one kilometer.

Air can absorb different amounts of water vapor. The warmer the air, the more water vapor it can absorb. Dew always looks the same, but it can occur for a variety of different reasons. Fog often forms in valleys, for example. The land in the valley cools rapidly, lowering the temperature of the air directly above it. Because cooler air holds less moisture, the water vapor in it condenses into droplets.

Over lakes and rivers, water evaporating into cold air can increase humidity until it reaches saturation point and then becomes foggy. The Grand Banks of Newfoundland in the North Atlantic are considered the foggiest place on Earth. When cold and warm air masses meet and mix, the warm, moist air cools, condensing its vapors into fog.

The same thing happens when your moist, warm breath touches cold air. Another type of fog can be seen in the mountains. When moist air rises up the side of a mountain, the air pressure and temperature drop. At a certain point, the water vapor condenses, forming “mountain fog”.