3. Why does a burning candle get shorter?
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As the fuel (wax) is melted and burned, the candle becomes shorter. Portions of the wick that are not emitting vaporized fuel are consumed in the flame. ... This ensures that the end of the wick gets oxygen and is then consumed by fire—a self-trimming wick.
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On heating, candle wax melts, then turns into vapour which reacts with alr to produce two new substances, carbon-dioxide and water.
Therefore a candle on burning becomes smaller and smaller and the part of wax which has undergone chemical change cannot be recovered.
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