Physical problems: I used to be a waiter in a hotel. When I get something from the cold storage in summer, there is fog on my glasses (water vapor in the air is liquefied)?

First of all, compared with winter, the air in summer is humid and the temperature is high. When you go into the cold storage to get something, the temperature of your glasses will drop. When you come out, glasses are low-temperature objects relative to air. At this time, the water vapor in the air will liquefy when it is cold. When you enter the cold storage again, because the air in the cold storage is dry and the temperature is low, the water vapor on the glasses will evaporate and your vision will become clear.

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