Breathing out with a mask outdoors in winter will produce white gas. How did this come about?

There is a layer of fog on people's glasses in winter because the gas exhaled by people is hot. When encountering a cold lens, the gas will instantly solidify into small water droplets attached to the lens, thus forming a layer of white fog. In fact, when wearing a mask, this situation can be avoided as long as the exhaled gas is as far away from the lens as possible. If you don't wear a mask, you can see white fog. When the exhaled air meets the cold air outside, it will crystallize into water vapor and stick to your hair to form a white cream.

Humans are internally heated animals. It is very cold in winter, and the temperature of human body is higher than that of air. The air exhaled by the human body is warmer than the outside temperature and quickly liquefies into water droplets, which is called breathing. Exhale and steam are the same, both are small water droplets, which shows that the main reason for the formation of small water droplets is temperature difference. When there is a temperature difference between gas and the outside world, it will quickly liquefy and form "exhalation" or "steam". When the water vapor in the mouth is exhaled and liquefied into small water droplets with the cold air outside, it is what we see as "breathing".

So what we think of as "breathing" is not gas, but liquid water droplets. My breath will be formed in winter mainly because the heat in my mouth has a certain amount of water vapor. Water vapor is in the air conditioner, heat condenses with the air conditioner, and gas becomes liquid, which is hot in the mouth and cold in the outside air. Your professional opinion on air atomization in oral cavity is that people are warm-blooded, and their body temperature is higher than air when air is cold. The generated gas is hot, but it meets cold air. The gas exhaled by people contains water vapor, which is gaseous at high temperature (36.5 degrees Celsius) just after exhalation. When the temperature is low in winter, the exhaled water vapor will condense into small water droplets with high concentration.

The above is Bian Xiao's detailed explanation of the problem. I hope it will help you. You can leave me a message in the comments section if you have any questions. If there is anything wrong, you can also interact with me more. If you like the author, you can also follow me. Your praise is the greatest help to me. Thank you.