When will the weather exhale white air? What is the principle?

Generally, in winter, when the weather is particularly cold, people will exhale white gas, mainly because there are many small water droplets, and white gas will appear.

It is winter to help people in the cold season. When they are outdoors, they will find that the exhaled gas is white. Many people want to know why. Some people think that the white gas exhaled by people in winter is a small water drop condensed by water vapor. In normal times, people can't see the water vapor in the air. We can find that water vapor is the same as air. It is colorless and transparent, and it has one characteristic. When the temperature is high, more water vapor can be filled. When the air is cold, there will be no more water vapor to find that the air will be saturated. For people, there is a lot of water vapor in the gas. The temperature is very high in summer, and the water vapor in the air can't hold it, so winter is different.

Because of the cold weather in winter, the saturation in the air will become lower, and the water vapor exhaled by people can't be contained in the air. Water vapor will evaporate when it is cold, and some fog will become small water droplets. These small water droplets are white gas in people's eyes through the refraction of light. Physically, this may be the liquefaction state of small waters. If a substance changes directly from a gas state to a liquid state, it is also an exothermic process in this process. It should be noted that white gas is not what people call water vapor, because water vapor is invisible and intangible. White gas is cooled by water vapor and finally liquefied into small water droplets and suspended in the air.

There are many phenomena in life. White gas will appear when people boil water, especially in winter, or some white gas will appear on the lake in winter, and some white gas will appear in summer. These are the same principles. To put it simply, this white gas is what everyone calls white fog. In winter, when hot air in people's mouth meets cold air, white air will appear.