Winter Common Knowledge: Don't use scarves as masks Winter Common Knowledge 1. Spread salt on the road You may have seen that there are cars that sprinkle salt on the road in winter, because the road with salt is not easy to freeze. The ingredie...
Winter Common Knowledge: Don't use scarves as masks
Winter Common Knowledge
1. Spread salt on the road
You may have seen that there are cars that sprinkle salt on the road in winter, because the road with salt is not easy to freeze. The ingredient of
salt is potassium chloride, and the ingredient of snow is water. Potassium chloride is a chemical that is extremely soluble in water. Potassium chloride is dissolved in water and forms an aqueous potassium chloride solution, which contains potassium ions and chloride ions. When water is about to freeze, when chloride and potassium ions exist, chloride and potassium ions will destroy the crystalline network structure of the water, preventing the water from freezing.
In other words, salt can prevent snow from freezing. In fact, snow is constantly melting and solidifying, but the two are at the same speed, so they always remain solid! After sprinkling salt, the water around the snow becomes salt water, so it cannot solidify! ! In this way, the snow will continue to melt and cannot solidify again, so there will be less and less!
salt is cheap and has no pollution (unlike coal). Therefore, when it snows, often sprinkle salt on the road surface to prevent the snow from freezing.
2. Don't use scarves as masks. When the weather is cold, people will wear scarves, which will keep warm. Many people habitually use scarves to block their noses and mouths, which is very unhygienic. Scarves are generally woven from raw materials for wool, rabbit hair or chemical fiber, and the scarf is not washed frequently like a mask. There are many pathogenic microorganisms, dust, etc. on it, which are harmful to the human body, especially allergic constitution. It is easy to cause respiratory diseases.
3. Is it cold in the north? What do you want to wear for the New Year there?
Our country has a vast territory, so the temperature difference in the south is also very large, so people in the south may have this problem if they want to go to the north to celebrate the New Year.
In the winter in northern cities, there is heating or geothermal heat, so it will be very comfortable and may be a little dry. Usually, it is just a humidifier. The outdoor temperature is relatively low. Northerners generally wear cotton wool pants. There are many types on the market, and then wear down jackets. If you don’t need to be outside for a long time, these are enough. The north is dry and cold, and the wind is more harsh, so try to buy down jackets as long as possible to block the legs. It is best to have a hat. If it is windy, you can wear them. You can also prepare a scarf. Also, you must wear gloves.
If you go to the countryside, usually every household will burn a fire kang, but no matter indoors or outdoors, the countryside is colder than in the city.
4. Be careful that iron is not just iron in winter, but other metals such as copper and aluminum will also have this phenomenon. If your hands are particularly wet, or if your tongue is moist, it will stick when you touch the iron in cold weather. Sometimes your hands are not wet, and it may stick to the iron that has been frozen for several days.
This is because when parts of your body with a lot of moisture come into contact with these metals, the temperature of these metals is extremely low and quickly transfers heat from the contact area, causing moisture on the surface to freeze. The actual adhesion is caused by icing. When the temperature of the metal is lower than the freezing point, because the metal has strong thermal conductivity, if you have water on your hands, it will freeze immediately once you touch the metal. From a microscopic perspective, your hands are frozen with the metal.
So everyone should pay attention to the cold weather. Do not touch the metal frozen outside if you are wet with watery hands or lips.
