Which is colder, dry or wet?

At the same temperature, wet cooling is colder than dry cooling.

Dry and cold means dry and cold, with low weather temperature and low humidity. Dry and cold are the climatic characteristics of the northern region. The northern region is dry and cool, but this is only the decrease of the surrounding temperature.

Humidity and coldness refers to a climatic feature that the human body temperature is much lower than the ambient air temperature in wet and cold weather, and it is also a climatic feature in winter in most parts of southern China.

Extended data:

Reason:

The wetter the air, the greater its thermal conductivity. In winter, the greater the relative humidity of the air, the easier it is for the human body to dissipate heat, and the colder it will feel. The south is wet and cold, and the north is dry and cold. At the same temperature, wet cooling is colder than dry cooling.

When the weather is dry and cold, it blows dry wind. Although cool, it has poor thermal conductivity, and it is not easy to penetrate into the body and take away heat.

The south is bitterly cold and wet. Although the temperature is not as low as that in the north, it is very permeable. Wet cooling does not mean that there is a lot of water vapor in the air, but that the air is full of droplets with a diameter of only a few microns. Although this kind of droplet is invisible to human eyes, it is easy to stick to human skin and take away the heat of the body with evaporation, which makes people feel cold.

Hazards of wet and cold: it is more likely to cause rheumatoid arthritis. Humidity and cold reduce the body's resistance, which often leads to the outbreak of influenza in the south in early winter.

In order to resist humidity and cold, please pay attention to:

1. The relatively safe heating method is to turn on the air conditioner. But it should be noted that turning on the air conditioner for a long time needs to humidify the room. From the perspective of the prevention and control of new crown pneumonia and respiratory infectious diseases in winter, don't forget to open a ventilation "gap" in cold weather.

2, eat enough and wear enough to keep out the cold: eat enough and eat enough calories to fight the cold winter. It will be colder to sit indoors in winter, so it is better to get up and walk in the office for a while, or stretch in the outdoor sun to supplement vitamin D to avoid low-temperature burns caused by sitting around the heater for a long time.

3. Keep warm and pay attention to several key parts.

(1) head

The head is a big radiator of the human body. When the cold wind is howling, keeping warm is the most important thing. Old people and children might as well put on hats or put a hooded sweater under them.

(2) feet and calves

As the saying goes, "cold comes from the soles of your feet." When sitting for a long time, pay attention to keep your calves and feet warm. Diabetic patients should pay special attention to protecting their feet in winter. Due to the peripheral neuropathy caused by diabetes, it is difficult for sugar friends to perceive the limit of cold and warm in time, leading to frostbite and burns, and even amputation in severe cases.

(3) Abdomen

Recently, the number of patients who come to see a doctor due to gastrointestinal discomfort such as abdominal pain and diarrhea has increased, especially the elderly and children. Besides keeping warm locally, we should avoid eating cold food, especially for the elderly and children.

On the one hand, the elderly and children are weak and easy to catch cold, and intestinal cold will lead to dysfunction, manifested as diarrhea, abdominal pain and even nausea and vomiting. On the other hand, when the room temperature is low, the food just out of the pot will soon get cold, and the elderly and children will eat slowly, which is easy to cause "gastrointestinal discomfort" because of eating cold food. In addition, flu, colds, etc. There will also be symptoms of digestive tract discomfort.

4, the elderly should pay attention to during cooling.

Professor Yu Tao, director of the medical department and deputy director of the emergency department of Sun Yat-sen Memorial Hospital of Sun Yat-sen University, reminded that elderly people with poor gastrointestinal function and various diseases should not be taken lightly during the cooling period.

After diarrhea in the elderly, according to old experience, don't "pour your stomach on an empty stomach." Instead, they should eat liquid food, such as rice porridge, to replenish water. During diarrhea, you should eat a light diet and a semi-liquid diet such as rice porridge, which is easy to digest. At the same time, pay attention to the supplement of water and electrolyte, and add some salt appropriately, such as rice porridge with a small amount of salt.

In particular, do a good job of gastrointestinal protection, such as not eating for too long, so as not to hurt the stomach with cold meals. If you feel uncomfortable, you can "save yourself" first and drink more warm water.

Old people should stay indoors and exercise. Yu Tao suggested drinking a cup of 300-500 ml warm water in the morning to promote intestinal peristalsis, pay attention to supplement vegetables and fruits, and drink yogurt in moderation. If constipation is serious, don't use laxatives yourself and seek medical advice in time.

Old people with hypertension, coronary heart disease, hyperlipidemia, stroke history or frail old age should go to the hospital as soon as possible if their mental state is poor, their lips are chapped, they lose appetite after diarrhea, or they have diarrhea for more than two days, and their stools are black or purulent more than five times a day.

Baidu encyclopedia-dry and cold

Baidu encyclopedia-wet and cold

People's Network-Is it reliable to resist the cold and dampness?