Mist

Mist is a natural phenomenon of small water droplets suspended as an aerosol in cool air, usually formed by condensation when warm, moisture laden air is suddenly cooled, such as when breath meets cold winter air or steam meets the outside air from a sauna, and its droplets condense more readily around nucleation sites that range from volcanic particles to atmospheric ions. It is distinguished from fog mainly by visibility: fog is defined as reducing visibility to a kilometer or less, or under 100 meters in British driving rules, while mist stays thinner, more transparent, and allows for better visibility. Usage also varies by place and setting, with cloud clinging to mountains often called mist while suspended moisture over water or marshland is more often called fog.