A ==Key Stage 3=====Meaning===[[File:ExplosiveSymbol.png|right|300px|thumb|The symbol for [[explosive]] [[chemical]] that s.]]An [[explosive]] substance is one which can [[Chemical Reaction|reactsreact]] very quickly , without the need for needing [[oxygen]] in from the [[air]] which creates , that produces a lot of [[gas]] when during the [[Chemical Reaction|reaction]]. ===About Explosive Substances===: [[Explosive]]s [[Chemical Reaction|reactingreact]] very quickly at high [[temperature]]s.: [[Explosive]] substances may contain [[oxygen]] or another [[Oxidising Agent|oxidising agent]] that allow it to [[Chemical Reaction|react]] without the need for [[oxygen]] in the [[air]].