Is fog a gas or a liquid?

When the relative humidity reaches 100%, the water vapor in the air will condense into fine water droplets suspended in the air, which will reduce the visibility on the ground. This weather phenomenon is called fog.

Liquid is one of the three forms of matter. It has no definite shape and is often influenced by containers. The influence of. But its volume is fixed at constant pressure and temperature.

A gas is a fluid like a liquid: it can flow or deform. Unlike liquids, gases can be compressed. If there is no restriction (container or force field), gas can diffuse, and its volume is infinite, not fixed. Atoms or molecules of gaseous substances can move freely with each other.

Extended data:

First, the causes of fog

When the water vapor contained in the air reaches the maximum, it reaches saturation. The higher the air temperature, the more water vapor it contains. 1 m3 air, the maximum water vapor capacity can reach 6.36g at 4℃.

When the temperature is 20℃, the maximum water vapor content in 1 m3 air is17.30g. If the air contains more water vapor than saturated water vapor at a certain temperature, the excess water vapor will condense out.

When enough water molecules are combined with tiny dust particles in the air, the water molecules themselves will stick to each other and become small water droplets or ice crystals.

Second, the formation conditions

The conditions of fog formation are cooling, humidification and condensation to increase water vapor content.

A kind of fog is formed by radiation cooling, which mostly appears at night and early morning, when the weather is clear, the breeze is light, the water vapor near the ground is rich and stable, or there is inversion. Meteorology calls it radiation fog.

The other is that warm and humid air moves horizontally, passing through the cold ground or water surface, and the water vapor in the air is gradually liquefied by cold to form fog, which is called advection fog in meteorology.

Sometimes the fog formed by two reasons is called mixed fog. It can be seen that it is late autumn and early winter that can meet these conditions, especially in the morning of late autumn and early winter.

References:

Baidu encyclopedia-fog

Baidu encyclopedia-liquid

Baidu encyclopedia-gas