Liquid methylamine has solvent properties analogous to those of liquid ammonia. Silicone easily migrates as either a liquid or vapor onto other components. Hence, temperature determines the concentration of vapor of the flammable liquid in the air. It is used as a liquid or powder. Products are available in powder, liquid or spray form. It is a clear, colorless, viscous liquid. Eel exists in a fluid state, neither entirely liquid nor solid. Helium is commercially available in either liquid or gaseous form. This is due to reactions in the liquid water droplets. Most ammonium salts are soluble and act as acids in liquid ammonia solutions. It is used to dispose of solid, liquid and gaseous waste. It is an odorless, colorless, sweet-tasting, viscous liquid. Water is also present in the atmosphere in solid, liquid, and vapor states. Surface tension is responsible for the shape of liquid droplets. Tesla uses proprietary technology for packaging and cooling the cells in packs with liquid coolant.