What is the physical phenomenon of Hui Nan Tian?

What is the physical phenomenon of "returning to the south"?

When the warm and moist airflow encounters cold walls, floors or glass windows, water droplets will appear. This is a What kind of physical phenomenon?

Answer: Liquefaction

What is the physical phenomenon of "returning to the south"?

When "returning to the south", the warm and moist airflow encounters cold walls, floors or glass Water droplets appear on the window. What kind of physical phenomenon is this?

The answer is liquefaction

Why is there water seeping on the Hui Nan Tian wall in the south? Answer with physics knowledge

Use physics knowledge to explain the water seeping on the "Hui Nan Tian" wall in the south The phenomenon is caused by condensation caused by the air temperature being higher than the wall.

Using meteorological knowledge to explain the phenomenon is that the temperature begins to warm up and the humidity begins to rise.

South China has a typical maritime subtropical monsoon climate. Therefore, from March to April every year, the warm and moist air blowing from the South China Sea meets the cold air flowing south from northern China, forming a storm in Lingnan. The quasi-stationary front makes the weather in South China unstable and very humid, with light rain or heavy fog during periods, resulting in the "returning to the south" phenomenon. When the surface of some cold objects encounters warm and humid airflow, it begins to condense and form water droplets on the surface of the object.

"Returning to the south" is a phenomenon of weather return to moisture, which usually occurs in February and March in spring. It is mainly because after the cold air has left, the warm and humid air flow quickly counterattacks, causing the temperature to rise, the air humidity to increase, and some cold weather to occur. When the surface of an object encounters warm and humid airflow, it is easy to produce water droplets. The phenomenon of returning to the south is more serious in the south, which is related to the fact that the south is close to the sea and the air is humid. When "Hui Nan Tian" appears, the air humidity is close to saturation, and water will appear on the walls and even the ground. There is a wet scene everywhere, and water seems to be squeezed out of the air. The dense fog is the most distinctive appearance of "Returning to the South Sky".

There are water droplets on the walls of Hui Nan Tian. Is it a physical change or a chemical change? Why?

It is a physical change, no chemical reaction occurs at all. According to the principles of physics, the air humidity in the south is high in spring, and the outdoor temperature is faster than indoors. When the humid air in the air encounters cold furniture and floors, condensation occurs, indicating indoor condensation. Recently, the influence of cold air has just ended, and walls, The surface temperature of the floor, door and window glass in the room is still relatively low. When the warm and humid air from the sea comes into contact with them, water vapor will easily condense into liquid water. The denser and smoother the surface, the less hygroscopic, the condensed water droplets will gather. Water beads up on the surface. As the temperature rises, this phenomenon will gradually ease.

Please use your knowledge of junior high school physics to answer. Why does spring come when you return to Nantian?

I don’t understand what “return to Nantian” means.

Floor and wall There are water droplets on the surface because the air humidity is high and the air temperature is higher than the temperature of the walls and floors. This causes the water vapor to release heat when it touches the walls and floors, turning into liquid water and adhering to the surfaces of the floors and walls.

< p> There are water droplets outside the window because the temperature inside the house is lower than the temperature outside, so the temperature of the glass is lower than the temperature of the air outside. The water vapor in the air outside touches the glass, releases heat, turns into liquid water, and adheres to the glass.< /p>

Turning on the air conditioner in summer is different from spring. Before turning on the air conditioner in summer, the temperature inside the house is high and the humidity is high, but the temperature outside is also high, so there are no signs on the glass. After turning on the air conditioner, the indoor air temperature changes. Low, well, it should not condense inside the glass window, it should condense on the heat exchanger of the air conditioner. Because at this time, the hot air in the room passes through the heat exchanger of the air conditioner, and the air conditioner The temperature of the heat exchanger is lower than the indoor air temperature, so water vapor condenses on the heat exchanger. The temperature of the outgoing air has been reduced and mixed with the unexchanged air. The temperature is still higher than that of the heat exchanger, so the air It will not condense water vapor into the glass window. You asked the wrong question this summer.

What is the physical phenomenon of Hui Nan Tian? a liquefaction b sublimation c condensation d vaporization

a

What does the "Beware of Bears" signs that are often posted on cars nowadays mean? 5 points

"Beware of Bears" is a warning to remind people to pay attention to bears in Hokkaido, Japan. Posting it on the car is nothing more than telling others that the car owner is more powerful, be careful and stay away from the car. But now there are too many posts and there is nothing new.

The original meaning of "Beware of Bears" is this: There are two iconic animals in Hokkaido, one is the owl, and the other is the bear. You can always see these two in shops at tourist spots and resorts. In the past, there were probably enough bears in Hokkaido, so people posted "Beware of Bears" warning signs in places where bears frequented. Now, this warning slogan has become a trademark, with black characters on a yellow background, and is used on T-shirts, wine glasses and many other products, becoming a characteristic of Hokkaido.

Nowadays...many people are not clear about this and have become a typical example of Hari. Thinking of the last time a pure girl showed off wearing a T-shirt with "no underwear" written on it, here is my sincere suggestion: If you don't understand Don’t use English words; don’t use signs whose origins you don’t know!!!