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Thermite is a pyrotechnic composition of metal powder and metal oxide. When ignited by heat or chemical reaction, thermite undergoes an exothermic reduction-oxidation reaction. Most varieties are not explosive, but can create brief bursts of heat and high temperature in a small area. 

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[tex]A \: thermite \: reaction \: is  \: a \\ reaction \: in \: which \: a \: metal \: \\ oxide \: is \: reduced \: by \: using \\ aluminium \: as \: the \\ reducing \: agent[/tex]