Hazard and Risk 11
Hazard and Risk 11 : Fires: (1) Thermal Radiation: The propagation of energy in the infra-red region of the electromagnetic spectrum. (2) Hazard and Risk 35: Fire: A process of combustion characterised by heat or smoke or flame of any combination of these. (3) Burning Rate: The linear rate of evaporation of material from a liquid pool during a fire, or the mass rate of combustion of a gas or solid. The context in which the term is used should be specified. (4) Jet Flame: The combustion of material emerging with significant momentum from an orifice. (5) Flame Front: The boundary between the burning and unburnt portions of a flammable vapour and air mixture, or other combusting system. (6) Flash Fire: The combustion of a flammable vapour and air mixture in which flame passes through that mixture at less than sonic velocity, such that negligible damaging overpressure is generated. (7) Lower Flammable Limit (LFL): That concentration in air of a flammable material below which combustion will not propagate. (8) Upper Flammable Limit (UFL): That concentration in air of a flammable material above which combustion will not propagate. (9) Fireball: A fire, burning sufficiently rapidly for the burning mass to rise into the air as a cloud or ball. (10) Fire Storm: An extremely large area fire resulting in a tremendous in-rush of air which may reach hurricane force. (11) Emissivity: The ratio of the radiation emitted by any surface or substance to that emitted by a black body at the same temperature. (12) Surface Flux: The radiant power emanating from unit area of a flame or other source. (13) View Factor: The solid angle subtended by the source at the target, as a proportion of the solid angle of a hemisphere. (14) Transmissivity: The fraction of incident thermal radiation passing unabsorbed through a path of unit length of a medium. (15) Absorptivity: The ratio of the radiant energy absorbed by any surface or substance, to that absorbed under the same conditions by a black body. (16) Fire Prevention: Measures taken to prevent outbreaks of fire at a given location. (17) Fire Protection: Design features, systems or equipment which are intended to reduce the damage from a fire at a given location.
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