One is its ability to generate sufficiently small water droplets, and the other is its ability to distribute a sufficient amount of water throughout the space. These two abilities are influenced by factors such as droplet size, velocity distribution, impulse, and nozzle geometry, as well as other objective factors such as the geometry of the protected object and the size of the protected space.
Fine water mist is unsuitable for extinguishing substances that cannot be extinguished by water, such as peroxides like potassium peroxide, sodium peroxide, barium peroxide, and magnesium peroxide, because these substances undergo violent decomposition reactions upon contact with water, releasing heat and generating oxygen. This can easily lead to explosions with certain organic materials, flammable materials, and light metals due to the rapid reaction rate. Fine water mist is also unsuitable for extinguishing substances that burn upon contact with water, such as metallic potassium and sodium, calcium carbide, aluminum carbide, sodium carbide, and potassium carbide.
