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The development of a fire is a progressive process that begins with ignition and passes through several stages depending on the availability of heat, fuel, oxygen, ventilation, and the characteristics of the materials involved. In hazardous material management, understanding these stages is essential because hazardous substances may increase the speed, intensity, toxicity, or complexity of a fire. Ignition is the initial stage at which sufficient heat energy is supplied to a combustible material to start combustion. Ignition may occur through an open flame, electrical spark, hot surface, chemical reaction, friction, or spontaneous heating. For hazardous materials, vapours, gases, dusts, _______ ___ _______ _____ ________ ____ __________ __________ _________ __________ ________ ____.
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