How is it that the warm wind glass is still foggy in winter?

In winter, the warm air glass will still fog, because the temperature difference between inside and outside the car suddenly increases when the heating is turned on, and of course the car glass will also fog. After a few minutes, the hot air dried the moisture in the car and the glass fog slowly disappeared.

Fog is caused by the temperature difference of "external cooling and internal heating". In most cases, the temperature inside the car is high, and the carbon dioxide exhaled by the drivers and passengers in the car contains a lot of water vapor, which will condense into small water droplets when it meets cold glass. Especially when people are full, the fog is generated very quickly.

When the windshield is foggy, open the windows on both sides, about one punch wide, to make the air inside the car convection, reduce the temperature difference between inside and outside the car, and eliminate the fog on the windshield.

When fog is found on the windshield, the quickest way is to adjust the air outlet to the front windshield and turn on the air conditioner to cool down. With the external circulation, the fog on the glass can be quickly "blown off" at the maximum air volume in about ten seconds.

If you want to make the car completely fog-free, you should choose to turn on the hot air to blow the windshield. The principle is to use warm air to blow dry the water vapor molecules in front of the windshield and circulate them outside the car to prevent them from condensing on the glass to form water droplets. But it takes a long time, so when using hot air to demist, it is recommended to stop at the side of the road and wait for a few minutes. This method has a slow defogging effect, but it works well in rainy and snowy weather.

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