Mixtures of flammable substances with air in the form of: gas, vapour, mist, dust or fibres, in which, after ignition, combustion spreads through the mixture.

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The potential for damage due to the uncontrolled propagation of an unwanted ignition requires our attention to be focused on eliminating the factors that determine combustion.

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We have known for a long time that for combustion, we need three basic elements: the fuel, the oxidizer and the source of ignition, which constitute the famous fire triangle.