Is fog formed because of water vapor in the air?

The details are as follows:

1. If the ground loses heat, the temperature drops, and the air is quite humid, then when it cools to a certain level, part of the water vapor in the air will condense. It comes out and turns into many small water droplets, which are suspended in the air layer near the ground, forming fog.

2. It and clouds are caused by the drop in temperature. Fog can actually be said to be clouds close to the ground. The temperature is higher during the day and the air can hold more water vapor. But at night, the temperature drops and the ability of the air to hold water vapor is reduced. Therefore, part of the water vapor will condense into fog.

3. Especially in autumn and winter, because the nights are long and there are more opportunities for cloudless winds, the ground dissipates heat more quickly than in summer, causing the ground temperature to drop sharply, which causes the air near the ground to The water vapor easily reaches saturation from late night to early morning and condenses into small water droplets, forming fog.

There are three definitions of fog:

1. When the visibility is lower than 1 km due to the condensation of suspended water vapor in the atmosphere, meteorology calls this weather phenomenon fog.

2. Fog is a cloud close to the ground.

3. Fog is an aerosol composed of tiny droplets suspended in the atmosphere (described in "Environmental Monitoring"). When the water vapor contained in the air reaches the maximum, it reaches saturation. As the temperature increases, The higher it is, the more water vapor the air can hold. When the temperature is 4°C, 1 cubic meter of air can hold up to 6.36 grams of water vapor; when the temperature is 20°C, the maximum amount of water vapor that can be contained in 1 cubic meter of air is 17.30 grams. If the air contains more water vapor than the saturated amount of water vapor at a certain temperature, the excess water vapor will condense out. When enough water molecules combine with the tiny dust particles in the air, the water molecules themselves will also interact with each other. When bonded, they become small water droplets or ice crystals. The water vapor in the air exceeds saturation and condenses into water droplets.