Why is it dry in winter and why is the weather so dry in autumn and winter?

In summer, the temperature is high, and the water easily evaporates into water vapor.

So the more moisture in the air, the more humid the air. In winter, when the temperature is low, there is less water vapor in the air, so it is dry.

Geography. Inside, we call the dryness and wetness of the air "humidity".

Of course, the reason why the air is dry in winter is not only the geographical reason that temperature affects the amount of water evaporation, but also:

1. For most parts of China, there is less precipitation in winter, and less water can evaporate into the atmosphere, and the air is dry.

2. There is a limit to the amount of water vapor that a certain amount of air can hold, which we call saturation, that is, relative humidity.

100%。In winter, the cooler air can hold less water vapor, which means that even if there is enough water to evaporate, the cooler atmosphere will appear dry.

3. There is another physiological reason: in winter, after we inhale air, the air is heated to body temperature, and the relative humidity will become very low (the same absolute humidity is different at different temperatures), so we will feel dry. The air we exhale is basically saturated vapor at body temperature.

So we consume a lot of water when we breathe. The nearby air is also heated, so the moisture is also easy to evaporate. These can make us feel that the winter is dry.

Why is the weather dry in winter The temperature is low and the saturation humidity value is small, that is, the absolute humidity and relative humidity are low, so that the body cannot lock in water, so we feel dry, drink more water, vegetables and fruits, and consume protein to supplement vitamins and trace elements in order to keep water loss.

I think it may be because the air circulates at a high rate and the humidity is low in winter, so it will be dry.

The main reason for the dry weather in winter is that there is less moisture in the atmosphere, resulting in low humidity.

Even if water vapor is 100% saturated in the air at low temperatures, its absolute water content is very small. This phenomenon can be used for "low-temperature drying", so the exposed food in the refrigerator will dry out.

It is recommended to drink plenty of hot water on a regular basis!

In autumn, when the weather becomes cooler, in order to reduce the heat in the body to the outside world, the blood vessels constrict, the pores are closed, and the activity of sweat glands and sebaceous glands is weakened, resulting in a decrease in the secretion of sebum, and it will become dry.

Winters are cold and long. The winter lasts for 5 months, and if the average temperature is below 0, it is 3 months (December to February). In midwinter, the average temperature in the plains is below -4, below -8 in the mountains, and the extreme minimum temperature in the plains.

Winter precipitation accounts for 2% of the annual precipitation, and there is often no precipitation (snow) for more than a month. Although the winter is cold and dry, there is a lot of sunshine, with an average of more than 6 hours of sunshine per day. Replenish water in time, eat more vegetables and fruits, pay attention to keeping warm, and pay attention to facial moisturization.

Because in autumn, the temperature begins to drop, the rainfall decreases, the air humidity is relatively low, and the climate tends to be dry.

Autumn air should be in the lungs, and the dry climate in autumn is very easy to damage the lung yin, resulting in dry mouth and throat, dry cough and less phlegm, **dryness, constipation and other symptoms, and severe cough with blood, so autumn health should prevent dryness.

In autumn, there is also a hint of autumn coolness in the dry air. After people vent too much in summer, the body's various tissue systems are in a state of relative lack of water, if you are cold by the wind at this time, it is easy to cause headaches, nasal congestion, stomach pain, joint pain and a series of symptoms, and even make old diseases or induce new diseases.

The elderly and people with weak constitution have poor adaptability and tolerance to this change, and should pay more attention to cold protection.

Categories: Education, Science, >> Science & Technology.

Analysis: In winter, China is controlled by the northwest monsoon, and the dry and cold air in the north will heat up slightly after moving south, and the relative humidity will drop more slowly, so it will be drier.

Winter rain and snow are scarce in northern China, the temperature drops, and the evaporation decreases.

The above two factors cause the winter to be dry in the north, but the front is not the same in the whole country, and the southwest region often has a wide fog in winter, indicating that those places are cold and humid in winter, because the southwest region is the least invaded by the cold current, resulting in a higher temperature in the southwest region at the same latitude in China.