What are the advantages and disadvantages of dust?

Hazards\x0d\Dust is the enemy of human health, so people especially hate it. Dust carries many bacteria, viruses and insect eggs flying everywhere, spreading diseases. Industrial dust and fiber dust can cause workers to suffer from various occupational diseases that are difficult to cure. Excessive dust can also cause environmental pollution, affect people's normal life and work, and induce human respiratory diseases...\x0d\The impact of dust on Computers are very harmful. Excessive dust may block the CPU fan and cause the fan to stop, causing the CPU to overheat and burn. It will also affect the contact between the boards and may also cause corrosion of the circuit board. (Hazards of dust) \x0d\Benefits\x0d\ If there is no dust in the atmosphere, the sunlight will not be absorbed, reflected, scattered and refracted, and the sky will be a vast expanse of white, without wind, snow, rain, dew, or glow. rainbow. Since dust is a hygroscopic particle, without its core, water vapor in the air will not be able to condense, and clouds in the sky will be difficult to form. Without cloud coverage, the earth's surface will become dry and barren, and the weather will be either too hot or too cold. Without dust, many harmful rays in the universe would penetrate the earth's surface without any hindrance and pose a fatal threat to humans and various living creatures. \x0d\In addition to these benefits, dust can condense water vapor. Let them turn into water drops, otherwise everything will be wet and living things will not survive. \x0d\Although dust has many shortcomings, its contribution is also immeasurable. It can allow the earth to gently obtain solar energy, and it can also provide enough condensation nuclei in the atmosphere to increase the chance of clouds and rain forming; it can regulate the temperature on the surface of the earth. , making it suitable for the survival and reproduction of life. \x0d\Types of dust\x0d\Dust can be roughly divided into three types according to particle size:\x0d\Dust\x0d\Dust is produced and dispersed into the air due to the crushing of objects\x0d\Condensation of solid smoke\x0d\Condensation Solid smoke is formed during the processes of combustion, sublimation, evaporation and condensation of substances. Its particle size is generally between 0.1μm and 1μm. It is different from dust and has great cohesion. Most of it is a gas formed during the melting process of metal substances. After cooling in the air, it condenses into solid smoke, and the particle shape is relatively regular. \x0d\\x0d\Smoke\x0d\Characteristics of Dust\x0d\ Judging from the physical properties of dust, dust is a solid impurity with irregular shapes, mostly angular and with colors such as gray, brown, and black, and It is water absorbent. When there is a large amount of dust in the air and the relative humidity reaches a certain level, water vapor forms water droplets, so the dust is easily moistened by water and can easily absorb moisture. \x0d\Looking at its chemical characteristics, the composition of dust is relatively complex, and it sometimes provides acid radicals and metal ions that cause degradation. Some dust itself is acidic or alkaline. For example, sulfuric acid smoke and photochemical smog are acidic, and particles such as metal oxides are alkaline. In addition, due to the small particle size and small surface area of ??the dust in the dust, their adsorption capacity is very strong, and they can adsorb harmful substances in the air to their surfaces, making them acidic or alkaline. Dust often contains substances such as clay, which absorb moisture from the air or the materials the archive is made of, causing it to undergo a hydrolysis reaction and decompose into sticky aluminum hydroxide. \x0d\ Its biological characteristics: Due to the small size and weight of mold spores, they drift everywhere with the air and inevitably adhere to dust. Therefore, dust is an ideal culture medium, breeding ground and disseminator of microorganisms. During the growth process, microorganisms secrete mold containing enzymes and organic acids.