Why is the air dry in winter?
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Therefore, domestic fastener companies should gradually reduce the proportion of ordinary fasteners and increase the output of high-margin high-strength fasteners to meet market demand. According to China's “Eleventh Five-Year Plan†railway development plan and investment plan, from 2008 to 2010 there will be an average annual investment of 350 billion yuan, which will ensure that in the next two years, the compound annual growth rate of railway investment is about 20%. If we consider that the country is increasing its investment in the railway industry to ensure stable economic growth, the investment growth rate of the railway industry will further increase. It is expected that the growth of the railway industry will not be lower than 25% in the next 2-3 years. Great protection. The guaranteed growth of rail transit will undoubtedly lead to a relative increase in the growth of the fastener industry. The guaranteed growth of the entire industry does not mean that all fastener companies can enjoy their food and clothing. In order to meet the needs of industry growth, domestic fastener companies have actively adjusted the product structure, gradually reduced the output of ordinary fasteners, gradually increased the proportion of high-strength fasteners, and achieved strategic transformation.
In 2009, the State Council has approved plans for subway construction in 22 cities, with a total investment of 882.003 billion yuan. Up to now, about 27 cities are preparing to build urban rail transit, 22 of which have been approved by the State Council. According to the author's understanding, around 2015, 22 cities including Beijing, Shanghai, and Guangzhou will construct 79 rail transit lines with a total length of 2259.84 kilometers and a total investment of 88,200.03 million yuan. According to incomplete statistics, there are about 50 cities in Beijing and Shanghai, and 1154 kilometers of rail transit lines are under construction. The constant “increment†of rail transit in China can not only promote the development of the railway industry, but also to a certain extent, it will also drive related industries, such as the huge development of the fastener industry. 
What we call humidity is divided into two kinds, absolute humidity and relative humidity.
Absolute humidity refers to the amount of water molecules per cubic meter of air.
Relative humidity refers to the ratio between "absolute humidity" and "saturation humidity".
"Saturation humidity" refers to the absolute humidity required for the water vapor in the atmosphere to reach saturation at a certain temperature. Saturation humidity is also closely related to temperature. The higher the temperature, the greater its value.
The drying or wetting we usually feel does not have a great relationship with absolute humidity, but mainly depends on relative humidity. Therefore, this issue should be discussed as follows:
On the one hand, when the temperature is low in winter and the saturated vapor pressure is small, the absolute humidity of the air is small.
On the other hand, when the temperature is low in winter, the value of saturated humidity is also small. When the absolute humidity is the same, the relative humidity is greater.
Generally speaking, there are positive and negative effects of temperature on humidity. Which role plays a major role should be discussed according to the actual situation.
In some areas it gets dry in winter, while in others it may get wet. The temperature is low in winter. Even if the relative humidity is 100%, the water vapor content is still very low. After we inhale air, the air is heated to body temperature, and the relative humidity will become very low, so we will feel dry. The air we exhale is basically saturated steam at body temperature, so we consume a lot of water when we breathe.
The air near the skin will also be heated, so the moisture of the skin is also easy to evaporate
The doctor suggested that an Aroma Diffuser should be placed indoors, which can effectively and immediately solve the problem of indoor air drying, humidify the air and solve the problem of air drying. The ultrasonic aroma diffuser should be used, and the fog should be sprayed out through vibration
High-strength fasteners help build high-speed rail
With the increased market capacity of railways and subways, the market demand for fasteners is accelerating production. Although the construction of the railway can not be separated from the role of fasteners, but not all specifications and models of fasteners are suitable for railway construction, the strength of some ordinary fasteners simply can not adapt to the high-speed rail vibration, rail and subway rail traffic All require stronger fasteners. With the continuous increase in railway construction, the demand for high-strength fasteners in China will also increase rapidly.