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In page Magnesium:

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Flame temperatures of magnesium and magnesium alloys can reach 3,100 °C (5,610 °F),[7] although flame height above the burning metal is usually less than 300 mm (12 in).[10] Once ignited, such fires are difficult to extinguish because they resist several substances commonly used to put out fires; combustion continues in nitrogen (forming magnesium nitride),[citation needed] in carbon dioxide (forming magnesium oxide and carbon),[11] and in water (forming magnesium oxide and hydrogen, which also combusts due to heat in the presence of additional oxygen). This property was used in incendiary weapons during the firebombing of cities in World War II, where the only practical civil defense was to smother a burning flare under dry sand to exclude atmosphere from the combustion.