What is aerosol?

Aerosol is a gaseous object, which consists of solid or liquid particles suspended in a gaseous medium.

Aerosols are made up of such particles. The particle size of aerosol is usually between 0.0 1 and 10μ m, but it varies greatly due to its source and formation. For example, the particle size of plant aerosol such as pollen is 5- 100? M, aerosol generated by wood and tobacco combustion, with a particle size of 0.0 1- 1000? M, wait

Aerosol particles have many shapes, which can be nearly spherical, such as liquid droplets, or irregular shapes such as flakes and needles. From the point of view of fluid mechanics, aerosol is essentially a multiphase fluid with gas as the continuous phase and solid and liquid as the dispersed phase. Aerosol particles can scatter light, which is why the sky turns blue and the sun turns red at sunset.

Disadvantages of aerosol

Aerosol can reflect sunlight into space, thus cooling the atmosphere and making the visibility of the atmosphere worse.

2. Aerosol can scatter, diffuse and absorb part of solar radiation through particles, thus reducing the escape of long-wave radiation on the ground and warming the atmosphere.

3. Smoke over industrial cities and smoke from factories and mines do great harm to human health, as well as acid rain that destroys nature and dust that easily causes explosion, all of which are related to aerosols.

4. Atmospheric aerosols generally affect the growth and development of plants by changing the quantity and quality of photosynthetic effective radiation or climatic factors (temperature, precipitation, directly changing PAR), that is, aerosol particles in the atmosphere absorb and scatter solar radiation, which reduces the solar radiation received by the ground, leads to the decrease of plant PAR and hinders crop growth.