Why does the Xiaomi 15 Ultra lens fog up?

The protection level of the Xiaomi 15 Ultra can reach IP68 level, but the inside of the mobile phone is not a vacuum, and the mobile phone can exchange internal and external gases. When the ambient temperature of the mobile phone changes rapidly, it will produce a condensation effect, which will produce fog on the lens.
If there is a lens water mist phenomenon, it can disappear naturally after standing for a few minutes at normal room temperature. If you need to use the camera function urgently, you can use the re-warming method such as touching the lens with your palm to make it dissipate quickly. If it has not been solved for a long time, please contact Xiaomi customer service directly, and we will deal with it for you as soon as possible.
This situation is similar to the winter from the cold outdoors into the warm room, the fog produced by the glasses, is a normal physical phenomenon, please don't worry too much, thank you for your understanding.