Why does the South Sky Wall leak water? Answer with physical knowledge.

Using physical knowledge to explain the water seepage phenomenon of the wall of "Huannantian" in the south is because the temperature is higher than the condensation phenomenon caused by the wall.

Condensation phenomenon:

One of the weather phenomena is the condensation of water vapor directly from the air on the surface or objects, including dew, frost, rain and fog deposition. Dew is water droplets condensed by water vapor on the ground and near-earth objects due to radiation cooling at night. On grass and leaves, it can gather into larger water droplets.

Dew phenomenon refers to the condensation of water vapor in the air when the temperature drops and the air humidity increases. For example, the water drops on the window glass in winter and the water drops on the bathroom wall are all condensation phenomena.

At a certain temperature, when the air can't hold more water vapor, it is called saturated air. When the water vapor in saturated air matches the temperature, there will be no water vapor condensation, but when the air reaches the supersaturated state, excessive water vapor will be generated and water vapor condensation will occur. If so, there will be a series of natural phenomena, such as rainfall.