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For other uses, see Smoke (disambiguation) . ]] Smoke is the airborne solid and liquid particulates and gases emitted when a material undergoes Pyrolysis or Combustion , together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted By-product of fires (including Stove s and Lamp s) and fireplaces, but may also be used for Pest Control (cf. Fumigation ), communication ( Smoke Signals ), defense ( Smoke-screen ) or Inhalation of Tobacco or other Drug s. Smoke is sometimes used as a flavouring agent and preservative for various foodstuffs. Smoke is also sometimes a component of Internal Combustion Engine Exhaust Gas , particularly Diesel Exhaust . Smoke Inhalation is the primary cause of Death in victims of indoor Fire s. The smoke kills by a combination of thermal damage, Poison ing and Pulmonary irritation caused by Carbon Monoxide , Hydrogen Cyanide and other combustion products. Smoke particles are actually an Aerosol (or Mist ) of solid particles and liquid droplets that are close to the ideal range of sizes for Mie Scattering of Visible Light . This effect has been likened to three-dimensional textured privacy glass—the smoke cloud does not obstruct an image, but thoroughly scrambles it. CHEMICAL COMPOSITION ": Skywriters use smoke to spell.]]The composition of smoke depends on the nature of the burning fuel and the conditions of combustion. Fires with high availability of oxygen burn in high temperature and with small amount of smoke produced; the particles are mostly composed of ash, or in large temperature differences, of condensed aerosol of water. High temperature also leads to production of Nitrogen Oxide s. Sulfur content yields Sulfur Dioxide . Carbon and hydrogen get completely oxidized to Carbon Dioxide and water. Fires burning with lack of oxygen produce significantly wider palette of compounds, many of them toxic. Partial oxidation of carbon produces Carbon Monoxide , nitrogen-containing materials can yield Hydrogen Cyanide , Ammonia , and Nitrogen Oxide s. Content of chlorine (eg. in Polyvinyl Chloride ) or other Halogen s may lead to production of eg. Hydrogen Chloride , Phosgene , Dioxin , and Chloromethane , Bromomethane and other Halocarbon s. Pyrolysis of the burning material also results in production of large amount of Hydrocarbons , both aliphatic ( Methane , Ethane , Ethylene , Acetylene ) and Aromatic ( Benzene and its derivates, Polycyclic Aromatic Hydrocarbon s; eg. Benzo {Link without Title} pyrene , studied as a cancerogen, or Retene ), Terpene s. Heterocyclic Compound s may be also present. Heavier hydrocarbons may condense as Tar . Presence of sulfur can lead to formation of eg. s (eg. Formaldehyde , Acrolein , and Furfural ), ketones, alcohols (often aromatic, eg. Phenol , Guaiacol , Syringol , Catechol , and Cresol s), Carboxylic Acid s ( Formic Acid , Acetic Acid , etc.). The visible particles in such smokes are most commonly composed of Carbon ( Soot ). Other particulates may be composed of drops of condensed tar, or solid particles of ash. Content of metals yields particles of metal oxides. Particles of inorganic salts may also be formed, eg. Ammonium Sulfate , Ammonium Nitrate . Many organic compounds, typically the aromatic hydrocarbons, may be also Adsorb ed on the surface of the solid particles. Smoke emissions may contain characteristic trace elements. Vanadium is present in emissions from Oil fired power plants and Refineries ; oil plants also emit some Nickel . Coal combustion produces emissions containing Selenium , Arsenic , Chromium , Cobalt , Copper , and Aluminium . Some components of smoke are characteristic for the combustion source. Guaiacol and its derivates are products of pyrolysis of Lignin and are characteristic for Wood Smoke ; other markers are Syringol and derivates, and other Methoxy Phenol s. Retene , a product of pyrolysis of Conifer trees, is an indicator of Forest Fire s. Levoglucosan is a pyrolysis product of Cellulose . Hardwood vs Softwood smokes differ in the ratio of guaiacols/syringols. Markers for vehicle exhaust include Polycyclic Aromatic Hydrocarbon s, Hopane s, Sterane s, and specific nitroarenes (eg. 1-nitropyrene ). The ratio of hopanes and steranes to elemental carbon can be used to distinguish between emissions of gasoline and diesel engines. {Link without Title} DANGERS OF SMOKE Smoke from oxygen-deprived fires contains a significant amount of compounds that are flammable. A cloud of smoke, in contact with atmospheric oxygen, therefore has the potential of being ignited - either by another open flame in the area, or by its own temperature. This leads to effects like Backdraft and Flashover . Many compounds of smoke from fires are highly toxic and/or irritant. The most dangerous is the Carbon Monoxide , leading to Carbon Monoxide Poisoning , sometimes with supporting effect of Hydrogen Cyanide and Phosgene . Smoke Inhalation can therefore quickly lead to incapacitation and loss of consciousness. Smoke can obscure visibility, impeding occupant exiting from fire areas. In fact, the poor visibility due to the smoke that was in the Worcester Cold Storage Warehouse Fire in Worcester, Massachusetts was the exact reason why the trapped rescue firefighters couldn't evacuate the building in time. Due to the striking similarity that each floor shared, the dense smoke caused the firefighters to become disoriented.http://www.telegram.com/static/fire/ VISIBLE AND INVISIBLE PARTICLES OF COMBUSTION Depending on particle size, smoke can be Visible or Invisible to the Naked Eye . This is best illustrated when Toasting bread in a toaster. As the bread heats up, the products of Combustion increase in size. These particles begin as invisible but become visible if the toast is Burnt . Smoke from a typical house fire contains hundreds of different chemicals and fumes. As a result, the damage caused by the smoke can often exceed that caused by the actual heat of the fire. In addition to the physical damage caused by the smoke of a Fire - which manifests in the form of stains - is the often even harder to eliminate problem of a smokey odor. Just as there are contractors that specialize in rebuilding/repairing homes that have been damaged by fire and smoke, Fabric Restoration companies specialize in restoring fabrics that have been damaged in a fire. SEE ALSO , used in beekeeping]]
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