Hui Nantian is a unique weather phenomenon in southern China, which usually refers to the phenomenon of warm resurgence in the public parts of buildings and indoor walls, floors and even surfaces of objects in winter and spring every year due to the warming of cold air and the rise of humidity in the atmosphere.
This weather often occurs when the weather begins to warm up after a stronger cold spell from the north invades the south, and is usually accompanied by heavy fog.
Many northerners come to the south, and when they come back to the south, they like to open doors and windows for ventilation, and they have to mop the floor according to the habits of the north, causing the house to be wet, and the walls and floors are about to burst with water, and they don't know how to deal with it.
Some people have to open doors and windows after the dampness occurs indoors, thinking that air convection will drive away the moisture in the room. In fact, the more doors and windows are opened, the more serious the resurgence will be.
The southern return to the south is like when we are outdoors in the northern winter, exhaling into the mirror, and a layer of water vapor will appear on the mirror. Because the temperature difference between the temperature of the mirror and the exhaled air flow of the human body is too large, the hot air flow condenses into water in an instant.
To put it bluntly, this principle is the same as the reason that the southern return to the south causes indoor dampness. Meteorologically, after a long period of low temperature, the surface and interior of the object are completely cooled, and when the temperature of the object is less than or equal to the ** temperature, the water vapor in the air reaches saturation and begins to condense on the surface of the object.
Affected by the warm and humid airflow from the south, the temperature in the south will rise rapidly after each cold wave. Usually, the air temperature outside rises first, while the temperature inside the building rises slowly. At this time, whether it is an office, a hotel or a home, once the door and window are opened, the warm and humid air flow outside will take the opportunity to enter, and the floor, wall and furniture will condense into water when the indoor temperature is cooler.
One of the ways to prevent it: when the humid "back to the south sky" hits, that is, when the temperature begins to rise after the cold wave is about to pass. Remember! Close the doors and windows tightly, so that the warm and humid air from the outside cannot enter the room, and do not mop the floor, so that the occurrence of indoor moisture return can be completely avoided.
Prevention method 2: You can turn on the electrical appliances with dehumidification effect in the home to reduce the indoor air humidity. General air conditioners have the function of dehumidification, but the way to adjust the humidity of indoor air with air conditioners is slow, takes two or three hours, and will make people feel cold indoors. You might as well go to the mall to buy a special dehumidifier, which has a faster effect, but also consumes relatively more electricity.
Precautions for returning to Nantian:
1. Usually after a cold wave, it will last for about 3 days back to the south. During this period, even if the sun comes out, you can't open the doors and windows. Only after the dampness of the ground in the outdoor common part has completely disappeared can the doors and windows be opened for ventilation.
2. The air humidity outside the south sky is high, and the clothes that are dried outside after washing are not easy to dry, so pay attention to preparing enough clothes for washing.
3. Articles and foods are easy to get damp, and then mildew and rot, and it is also particularly easy to breed bacteria, so moisture-proof measures should be taken appropriately.
4. Even if the indoor home prevents the impact of the return to the south of the sky, it is usually difficult to prevent the outdoor public part, and you must pay attention to safety when you go out, especially the elderly to prevent slipping and falling.
5. Beware of the occurrence of diseases. Humid and foggy weather can easily lead to respiratory diseases, rheumatism, joint pain, and muscle pain**. Therefore, people with these diseases need to pay attention to keeping warm and reducing going out. Patients with high blood pressure should take medication on time, monitor blood pressure, and pay attention to preventing the occurrence of stroke and other diseases.
6. Pay attention to safety when driving. In wet weather, pay special attention to the visibility of the vehicle and check the safety and technical condition of the vehicle. Turn on the defogging equipment in the car in time to prevent water vapor from appearing on the front windshield of the car and affecting the line of sight. Reduce the speed of the vehicle appropriately, and try not to use the high beam when driving at night, so as not to make the lights in front of the car reflect blank by the fog, and you cannot see the vehicle in front of you.
This article ** comes from the Internet).