droplet

in atmospheric chemistry
https://doi.org/10.1351/goldbook.D01861
A small liquid particle. The size of droplets encountered in the atmosphere extends over a wide range; e.g. liquid @A00176@ solutions which make up the fine particle fraction of continental tropospheric @A00176@ are usually \(2\ \unicode[Times]{x3BC}\text{m}\) in diameter. Cloud water droplets usually have diameters in the range of \(5-70\ \unicode[Times]{x3BC}\text{m}\), while rain droplets commonly have diameters ranging from \(0.1-3\ \text{mm}\).
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2185 [Terms] [Paper]