烟系固体或液体质点在空气中的胶体混悬,这类体系以专门名辞称之为气溶胶(aerosols),其他如烟雾,浮尘,雾及云也都是气溶胶。雾及云的微粒通常为较大水粒,最后或沉淀为雨,或蒸发为大气潮湿。浮尘系由大块物机械地分散而成的固体微粒,烟雾通常为化学作用或挥发作用的产物。这类体系具有许多共同点,并遵从相同的普通定律,如移动,凝固,沉淀,扩散,及光的密度等。 Smoke is a colloidal suspension of solids or liquid particles in the air. Such systems are called aerosols in their own names, and aerosols, such as smoke, dust, fog and clouds, are also aerosols. Fog and cloud particles are usually larger water particles, and finally precipitation or precipitation, or evaporation of atmospheric moisture. Dust is a solid particle that is mechanically dispersed from bulk materials and is usually the product of chemical or volatile effects. Such systems have many things in common and follow the same general laws, such as movement, solidification, precipitation, diffusion, and light density.