Why are some people afraid of the cold, but others can walk around in short-sleeved shorts?

The cold air seems to have come early this year. Apparently, not long ago, I was running around in a T-shirt. After several rains, I jumped directly from summer to winter! It also snowed heavily in many places in the north. People are shivering in the high temperature. Have you ever wondered what it's like to be cold? Why are some people afraid of the cold, but others can walk around in short-sleeved shorts?

Come on, now calculate your body temperature.

In fact, in the human body, there is a sophisticated air conditioner, and 37℃ is only an approximate temperature figure. The body temperature of different parts of the human body is different, sooner or later, and there are also differences between men and women. The regulation of body temperature is very accurate. When the temperature changes by 0.5℃ compared with the normal value, it will make you feel uncomfortable.

▲ The national temperature has dropped, and it is said that it snows in Beijing.

At what temperature will people feel cold? When the outside temperature is lower than 20 degrees Celsius, the temperature difference between human body and outdoor is 17 degrees, and people usually start to feel cold, but when the temperature is lower than 10 degrees, they will feel frozen. Many people are so cold that people put on long trousers silently. What kind of fashion do you want? Help is important. )

The external wind and humidity affect the somatosensory temperature. When the temperature drops, the body silently forms a small air layer around you to keep you warm. The temperature of the small air layer is slightly higher than the body temperature and slightly lower than the body temperature. At this time, there is a strong wind, and the warm little air layer is blown away, so you will naturally feel cold.

▲ The somatosensory temperature displayed by infrared irradiation.

Similarly, humidity will also affect the somatosensory temperature. When it's cold, the greater the humidity, the colder it gets (which is why many northerners come to Jiangnan, and when there is no heating in winter, they are too cold to take out their quilts! ); When it's hot, the higher the humidity, the hotter it gets (think sauna days). The most typical contrast is Beijing and Shanghai: Shanghai feels colder in winter with the same temperature.

▲ The above data comes from the data of Ink Weather APP 654381October 30th.

The somatosensory temperature has a complex calculation formula, which is multiplied by a simple coefficient before the wind speed and a simple coefficient before the humidity. It is necessary to combine theory with local coefficient. Every day, you can refer to the "Ink Weather App" to find the data of the day.

Why do we feel cold? There are two kinds of temperature receptors around the human body: cold receptors and warm receptors, which are distributed in skin, mucosa and viscera. When the human body is stimulated by low temperature, the cold receptors will be excited, and the signals will be transmitted to the temperature sense center of the cerebral cortex through nerves, which makes people feel cold.

Sudden cooling, how to wear it to keep warm?

In case the cliff cools down, are you wearing the right clothes? After the cold weather, the human body's ability to resist the cold drops. If you want to avoid the invasion of cold evil, you can't ignore keeping warm and pay attention to it from head to toe.

The thicker clothes you wear, the less you catch a cold. It's cold, so you should put on more clothes, but the warmer you cross. To choose clothes with suitable materials, it is suggested to choose clothes with low air thermal conductivity, which can better preserve body heat and thus play a role in keeping warm.

The warmth retention of clothing is related to air content, air permeability and material thickness, and clothing mainly keeps warm by reducing heat conduction.

Keeping dry is the first priority of keeping warm. From the material of clothes, polyester, nylon and other chemical fiber clothes will keep warm better than what we thought before, because cotton fibers of cotton fabrics absorb water and moisture, which is not conducive to water evaporation and will lead to wet and cold.

When you go out, you will definitely wear a thick warm layer. At this time, cotton, sweaters and sweaters are common choices. But no matter what kind of "cage built with fiber", the air is fixed and warm-because air is a material with low thermal conductivity among common substances, if a coat can be filled with air, it is both light and warm.

Warm-keeping manuals from all over the country.

Although the whole country is cooling down together, there will be a difference of two hours before and after dawn on 9.6 million square kilometers, not to mention the temperature. As mentioned above, humidity, wind, warm source and psychological endurance will all affect our body temperature, so the rules of warm clothing in different regions are different. Let's learn:

Central South and East China: As the regions with the highest latitude of humidity, cold, wind and no heating, they have been called the "most abnormal cold wave" in China in recent years. When the cold wave comes, this area needs both thermal underwear and external equipment. It is strongly recommended to wear thermal underwear on the close-fitting layer, plus down jacket on the middle layer and down jacket on the inside to protect the outer layer from wind. If possible, you can also choose waterproof and breathable coated coats and shoes, which is more convenient in rainy days (snowy days).

South China: Although the degree of cold is the same as that in Central and South China, it is much lighter. Therefore, the thickness and performance of each layer are lighter than those in Central and South China. In fact, the winter in South China is not so humid, because the wettest season is in the spring of April and May, which is the most famous "returning to the south sky", and mushrooms grow on the walls.

Northeast China: Most of the big cities in Northeast China are located in the western plain, which is relatively dry. The close-fitting layer does not have such high requirements for "quick drying", and the key point should be to keep warm-the middle layer can keep warm by thickness, of course, it is more efficient to use down jackets and it is more comfortable to wear. If combined with the new technology in recent years, the inner infrared reflective coating can wear less steamed buns.

North China and West China: Dry, cold and windy are the characteristics of winter in this area. So in addition to heat insulation, the key to keeping warm is to keep out the wind. Because the absolute temperature is not as low as that in the northeast, as long as the strong wind is not allowed to blow away the heat in the body, the heat insulation measures when going out need not be prepared as in North China.

Of course, here is just a typical winter weather situation in various regions as an example. What to wear depends on the local weather on that day. Remember that besides temperature, there is also humidity and wind, so pay attention to humidity and wind direction when watching the weather forecast ~

afterword

There is a cold called quenching. Are you still rummaging through cotton-padded clothes and trousers everywhere?