A small liquid particle. The size of droplets encountered in the atmosphere extends over a wide range; e.g. liquid @[email protected] solutions which make up the fine particle fraction of continental tropospheric @[email protected] 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 \(0.1-3\ \text{mm}\).