Fog is like a cloud that forms close to the ground. It happens when tiny water droplets or ice crystals hang in the air, making it hard to see far.

The air around us always has some water vapor (tiny water droplets) in it. When the air cools down, especially at night, the water vapor turns into tiny water droplets. This process is called condensation. These droplets are suspended in the air forming a cloud at ground level.



Fog usually forms when the air is very humid and cools down quickly, like on clear, calm nights or near bodies of water

Types of Fog

Radiation Fog: Forms on clear nights when the ground cools down quickly, and the air near the ground cools too, causing water vapor to condense.

Advection Fog: Happens when warm, moist air moves over a colder surface, like when warm air from the ocean moves over cold land.

Evaporation Fog: Forms when cold air moves over warm water, causing water vapor to rise and cool, turning into fog.

Freezing Fog: Occurs when water droplets in the fog freeze on surfaces, creating a layer of ice.