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【有关火药的英语作文80词左右】
有关火药的英语作文80词左右
Gunpowder,alsoknownsincethelate19thcenturyasblackpowder,wasthefirstchemicalexplosiveandtheonlyoneknownuntilthemid-1800s.
Itisamixtureofsulfur,charcoal,andpotassiumnitrate(saltpeter)—withthesulfurandcharcoalactingasfuels,whilethesaltpetreworksasanoxidizer.Becauseofitsburningpropertiesandtheamountofheatandgasvolumethatitgenerates,gunpowderhasbeenwidelyusedasapropellantinfirearmsandasapyrotechniccompositioninfireworks.
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