Question

why does a burning candle become shorter ?​

Answer 1

Answer:

For a candle to burn, a heat source (commonly a naked flame) is used to light the candle's wick, which melts and vaporizes a small amount of fuel (the wax). Once vaporized, the fuel combines with oxygen in the atmosphere to ignite and form a constant flame...

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Answer 2

Answer:

Burning candle become shorter because due to the production of heat the wick starts to melt and vapourize the small amount of fuel