What are aerosols?
Aerosol is a colloidal dispersion system formed by small solid or liquid particles dispersed and suspended in a gas medium. It is also called a gas dispersion system. The dispersed phase is solid or liquid small particles with a size of 0.001 to 100 μm, and the dispersion medium is gas. Liquid aerosols are often called fog, and solid aerosols are often called smoke.
Clouds, fog, dust in the sky, smoke caused by unburned fuel in boilers and various engines used in industry and transportation, mining, quarry grinding and food processing The solid dust formed when air pollution occurs, artificial masking smoke screens and toxic smoke are all specific examples of aerosols.
The elimination of aerosols mainly relies on atmospheric precipitation and the collision, condensation, aggregation and sedimentation processes between small particles.
Extended information:
The impact of aerosols:
1. Global warming
Fog, smoke, dust, etc. are the most common of natural aerosols. By pressurizing the seal, aerosols can be generated from a wide variety of substances, including pesticides, paints, hairspray sprays, and more. This substance is mixed with an easily liquefied gas (often a hydrocarbon with trace amounts of fluoride or chloride added), which produces a propulsive effect once the pressure is released.
2. Environmental pollution
Haze is a phenomenon where a large number of extremely fine dry dust particles float evenly in the air, making the air generally turbid with horizontal visibility less than 10 kilometers. The dry dust here Particles refer to dry aerosol particles. Under normal circumstances, when the visibility is between 1 and 10 kilometers, there may be both the influence of dry aerosols (that is, the influence of haze) and the contribution of water droplets (that is, the contribution of light fog), and it is difficult to distinguish, so it is called "Fog-haze" phenomenon.
3. Agricultural impact
The impact of aerosols on climate and environment will definitely affect the growth of vegetation and agricultural production. Atmospheric aerosols include many types. According to the source of their components, aerosols can be divided into anthropogenic aerosols (sulfates, nitrogen compounds, fluorides, black carbon and metal dust) and natural source aerosols (volcanic ash and dust).
Baidu Encyclopedia-Aerosol