A new study conducted in Ireland has raised concerns about the potential health risks associated with burning scented candles ...

What does burn, however, are the vapors that emanate from solids and liquids. With a lighted candle, melted wax travels up the wick. When the wax reaches the hot flame along the wick, it vaporizes.

SAFETY: This experiment involves the use of lit candles. Young children should be ... If you take the oxygen away, the fire cannot burn and it goes out. CO2 is a gas that is heavier than oxygen.