Aerosols
Definition and meaning of Aerosols in chemistry.
Aerosols are colloids consisting of solid particles or liquid droplets suspended in a gas, typically air. They range in size from about 0.001 to 100 micrometers and remain dispersed for extended periods.
In more detail
Aerosols form through natural processes such as evaporation and sea salt spray, as well as human activities including vehicle emissions and industrial combustion. They play a critical role in atmospheric chemistry, affecting visibility, air quality, and climate by scattering and absorbing solar radiation. Their lifetime and behavior depend on particle size, composition, and atmospheric conditions such as temperature and humidity.
Key facts
| Particle Size Range | 0.001–100 micrometers |
|---|---|
| Common Types | Fog, smoke, dust, sea salt spray, pollution, mist |
| Atmospheric Impact | Affects visibility, air quality, radiation balance, and climate |
| Field | Physical Chemistry |
Cigarette smoke is a common aerosol composed of fine solid particles and liquid droplets suspended in air.
Frequently asked questions
Are all aerosols harmful?
No. While anthropogenic aerosols from pollution harm air quality, natural aerosols like sea salt spray and mineral dust are part of Earth's normal atmospheric processes.
How long do aerosols stay suspended in air?
Aerosol lifetime ranges from minutes to weeks depending on particle size and composition; smaller particles remain suspended longer than larger ones.