Is fog a gas or a liquid?

Fog is formed in the evening or early morning, when there is enough water vapor in the air, the earth's atmosphere is relatively stable and the breeze is blowing gently. When the relative humidity reaches 100%, the water vapor in the air will condense into water droplets suspended in the air, which will reduce the ground visibility and form fog.

Fog occurs more frequently in February and April in spring. When the visibility in the atmosphere is lower than 1 km due to the condensation of suspended water vapor, meteorology calls this weather phenomenon fog, so fog is liquid.

The color of fog

Experiments show that when white light shines on a transparent object, the transmitted light is mainly the same color as the transparent object, and all other colors are absorbed by transparent body. If a transparent object can transmit all colors of light, then the transparent body is colorless, such as ice.

But when water turns into fog, many reflecting surfaces are formed. At this time, light can't penetrate, but is reflected, that is to say, all colors of light are reflected, so the fog becomes white.