Take three papers of the same size. Keep one stretched. Crumble the next. Make the third paper wet using water. Burn each of them over a candle flame using pincers. Compare the burning of each.
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Stretched paper
Crumbled paper
Wet paper
$$\bullet$$ Burns very well
$$\bullet$$ Burns slowly
$$\bullet$$ Burns very slowly.
$$\bullet$$ Completely becomes ash.
$$\bullet$$ Some ash is produced
$$\bullet$$ Some part is left unburnt.
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