What is aerosol?

Aerosol is a colloidal dispersion system formed by small solid or liquid particles dispersed and suspended in gas medium, also known as gas dispersion system. Its dispersed phase is solid or liquid particles with the size of 0.00 1 ~ 100 micron, and the dispersion medium is gas. Liquid aerosol is usually called fog, and solid aerosol is usually called fog smoke.

Clouds, fog, dust in the sky, smoke from unburned fuel in boilers and various engines used in industry and transportation, solid dust formed in mining, quarry grinding and grain processing, artificial masking smoke and toxic smoke are all concrete examples of aerosols.

The elimination of aerosol mainly depends on the processes of atmospheric precipitation, collision, condensation, polymerization and sedimentation among small particles.

Extended data:

Effects of aerosols:

1, global warming

Fog, smoke and dust are the most common natural aerosols. By pressurizing the sealing device, aerosols can be generated from various substances, including pesticides, paints, hair styling agents, etc. This substance is mixed with an easily liquefied gas (usually hydrocarbon plus a little fluoride or chloride), and once the pressure is released, the latter will generate propulsion.

2. Environmental pollution

Haze is a phenomenon that a large number of extremely fine dry dust particles float in the air evenly, which makes the air with horizontal visibility less than 10 km generally turbid. Dry dust particles here refer to dry aerosol particles. Generally speaking, when the visibility is between 1 ~ 10 km, there may be both the influence of dry aerosol (that is, the influence of haze) and the contribution of water droplets (that is, the contribution of light fog), which is not easy to distinguish, so it is called "fog-haze" phenomenon.

3. Agricultural impact

The impact of aerosol on climate and environment will inevitably affect the growth of vegetation and agricultural production. There are many kinds of atmospheric aerosols, which can be divided into artificial aerosols (sulfate, nitride, fluoride, black carbon and metal dust) and white aerosols (volcanic ash and dust) according to the source of components.

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