A general term applied to a @[email protected] of droplets in a gas. In meteorology, it refers to a @[email protected] of water droplets resulting in a visibility of less than \(1\ \text{km}\).
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 606 [Terms] [Paper]
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2190 [Terms] [Paper]