why a matchstick is rubbed before burning it
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When a matchstick is rubbed with the matchbox, it lights up due to friction.
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When the matchstick is rubbed against the side of the match box, some of the red phosphorus is converted into white phosphorus; this immediately reacts with potassium chlorate in the matchstick head to produce enough heat to ignite antimony trisulphide and starts the combustion of matchstick.
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