Back to NantianThis word is often on people's lips in the southern part of China. Every spring, when the cold winter gradually recedes and the warmth grows, people begin to look forward to this special moment.
So,Back to NantianWhat exactly? It is not a mystical ritual, but a meteorological phenomenon. Usually occurs every yearMarch-April, that is, in the second and third months of the lunar calendar in spring. When the cold air leaves, the warm and humid airflow rises rapidly, causing the temperature to rise and the air humidity to increase. As a result, some originally cold surfaces absorb heat and reduce the surrounding air temperature after encountering warm and humid air currents, thus condensing water droplets. That's what we often sayBack to Nantian
Specifically, the main reasons for the formation of Hui Nantian are as follows:
Relationship between air temperature and relative humidity: Relative humidity is affected by changes in air temperature. As the temperature rises, the amount of water vapor that air can hold increases. When the moisture content in the air (absolute humidity) is constant, the relative humidity changes with temperature.
Warm and humid air flows in: In the south, in February-March, the temperature is relatively low. At this time, if the warm and humid air blows along the sea breeze, 90% of the hot air meets the cold air, just like pouring water from a large bottle that is almost full into a small bottle, and the relative humidity exceeds 100%, the walls and floors begin to condense a large number of water droplets, forming a phenomenon of returning to the south sky.
The humidity is close to saturation: When I go back to Nantian, the air humidity is close to saturation, and the walls and even the ground will "bubble with water", and there will be a wet scene everywhere, and the air seems to be able to wring out water.
Although it is not very comfortable to return to the south, it also indicates the arrival of spring, when everything wakes up and the temperature warms up. At this time, we need to pay attention to the problem of moisture and mildew resistance, such as using dehumidifiers or moisture-proof supplies.