amount pressure in fluorescent tubes
The chemical composition of this coating is selected to emit in a desired spectrum. A fluorescent lamp tube is filled with a gas containing low pressure mercury vapour and noble gases at a total pressure of about 0.3% of the atmospheric pressure. Fluorescent lamps are highly efficient, using electric discharge through low-pressure mercury vapour to produce ultraviolet (UV) energy. Identification: Fluorescent lamps generally range in diameter from 2.54 to 3.81 centimetres (1 to 1.5 inches); and in length rom 0.61 to 2.44 meters (2 feet to 8 feet). Keep in mind that CFLs contain a very small amount of mercury -- less than 1/100th of the amount in a mercury thermometer. However, if you are concerned about your health after cleaning up a broken CFL, consult your local poison control center by calling 1-800-222-1222. Many types of light bulbs contain metals such as mercury. Examples include: tube- and compact-style fluorescent bulbs, including compact fluorescent lamps (CFLs); mercury vapor bulbs – i.e., high intensity lamps with blue-white, originally used as farmyard lights; metal halide bulbs – i.e., newer, more efficient high intensity lights; and. Inside the lamp end of a preheat bi-pin lamp. In this lamp the filament is surrounded by an oblong metal cathode shield, which helps reduce lamp end darkening. A fluorescent lamp or a fluorescent tube is a low pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. You should follow the recommendations on this page if you've broken either a CFL or another type of mercury-containing light bulb, such as: 1  Fluorescent bulbs: Linear, U-tube and circline fluorescent tubes. 2  High intensity discharge bulbs: Metal halide. 3  Mercury short-arc bulbs; and.  Neon bulbs. Seattle, WA 98104-3855. Fluorescent bulbs and tubes contain mercury. Fluorescent bulbs and tubes are a great way to save energy. They use three-quarter less energy than incandescent lamps. and are safe to use but contain mercury. Mercury is a toxic. substance that can aff ect the brain and kidneys. A fluorescent lamp generates light from collisions in a hot gas (‘plasma’) of free accelerated electrons with atoms– typically mercury – in which electrons are bumped up to higher energy levels and then fall back while emitting at two UV emission lines (254 nm and 185 nm). Before Cleanup. Have people and pets leave the room, and avoid the breakage area on the way out. Open a window or door to the outdoors and leave the room for 5-10 minutes. Shut off the central forced-air heating/air conditioning (HVAC) system, if you have one. Examples include: 1  tube- and compact-style fluorescent bulbs, including compact fluorescent lamps (CFLs); 2  mercury vapor bulbs – i.e., high intensity lamps with blue-white, originally used as farmyard lights; 3  metal halide bulbs – i.e., newer, more efficient high intensity lights; and.
0.3% of the atmospheric pressure.