Gunpowder explodes in vacuum (absence of air). Explain?

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Solution

Gunpowder, is a mixture of sulfur, charcoal, and potassium nitrate (saltpeter). The sulfur and charcoal act as fuels, and the saltpeter is an oxidizer.
$S + C h a r c o a l + K {N O}_{3}$ = Gunpowder Composition.
Gun Powder explodes in vacuum (absence of air) because saltpeter $K {N O}_{3}$ is an oxidizer and it does not require oxygen from atmosphere to burn.

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