Ultrasonic humidifiers are the quietest humidifiers available, and the ideal choice when noise level is a concern (if you are a light sleeper). In general, a warm moisture humidifier will be much quieter than a cool moisture evaporative humidifier.
Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas. The elemental form was discovered by the French chemist Bernard Courtois in 1811.
1.) Luminol must be activated by hydroxide salt forming a dianion: In the presence of iron (catalyst), hydrogen peroxide decomposes to form oxygen. The dianion reacts with oxygen producing the unstable organic peroxide intermediate: This intermediate decomposes from higher energy states to the ground state, emitting a photon. intersystem crossing is radiationless transition between different states of spin multiplicity