The double window glass at home is foggy in the morning. Why?

Fogging of glass is caused by excessive temperature difference between indoor and outdoor, which is called condensation phenomenon.

When the weather temperature is low, the heating temperature is higher when the indoor air is closed and ventilated without windows, while when the outdoor temperature is below zero, the moisture in the indoor air will condense into water droplets when it meets the window glass, and attach to the glass surface to form water mist.

When water drops accumulate to a certain extent, they will drop downstream if they cross the adhesion. The greater the temperature difference between indoor and outdoor, the higher the indoor humidity and the more condensed water.

On the positive side, dew on doors and windows is less common, but on the negative side, dew in kitchens and bathrooms is more common.

Extended data:

Countermeasures for glass fogging;

1. Open the window for ventilation: properly open the window for ventilation every day, which can reduce the air humidity and discharge the moisture generated during the day's activities. Dewdrops with glass knots can also be dried normally.

2. Turn on the exhaust fan: the space with the exhaust fan can be properly opened, which can reduce or eliminate the problem of condensation.

3. Wipe the glass: If you feel that the window is ventilated and cold, you must wipe off the dew on the glass with an ordinary rag to prevent water from forming and flowing to the window sill and the ground, which will damage the interior decoration.

Baidu Encyclopedia-Jielu