Dust is characterized by irregular shape, angular and with gray, brown, black and other colors, and has water absorption. When there is a lot of dust in the air and the relative humidity reaches a certain level, water vapor forms water droplets, so the dust is easily wetted by water and easily absorbs water.

Looking at its chemical characteristics, the composition of dust is more complicated, and sometimes it provides acid radicals and metal ions that lead to degradation. Some dust itself is acidic or alkaline, such as sulfuric acid smog, photochemical smog, metal oxides and other particles are alkaline.

In addition, the floating dust in the dust is acidic or alkaline because of its small particle size, small surface area and strong adsorption capacity. Dust often contains substances such as clay, which will absorb moisture in the air or substances composed of archives, make it undergo hydrolysis reaction and decompose viscous aluminum hydroxide.

The benefits of dust:

Dust can absorb, reflect, scatter and refract the light directly emitted by the sun to the earth, producing snow, rain dew, glow and rainbow. Because dust is hygroscopic particles, water vapor in the air will condense and form clouds in the sky, which also prevents many harmful rays in the universe from entering the earth's surface.

In addition to these benefits, dust can condense water vapor and turn them into water droplets.

Although Dust has many shortcomings, its contribution is endless. It can make the earth get solar energy gently, and it can also make enough condensation nuclei in the atmosphere, increasing the chances of cloud and rain formation. Adjust the surface temperature to make it suitable for the survival and reproduction of life.

Refer to the following: Baidu Encyclopedia-Dust