Definition of Water Mist
International standard for water mist definition:
American Fire Protection Association Water Mist Fire System Standard (NFPA750), in which the definition of water mist is: the water at the thickest part of the water mist is measured at a minimum design working pressure and at a distance of 1 m from the nozzle. The particle diameter Dv0.99 is not more than 1000 μm. That is to say, on this plane, 99% of the droplet diameter is less than or equal to 1000 μm.