schoolscienceproject.blogspot.in
Jet of flame
Light a candle,
let it burn for a while, and blow it out again. White smoke rises from the
wick. If you hold a burning match in the smoke, a jet of flame shoots down to
the wick, and it re-lights. After the flame is blown out the stearin is still
so hot that it continues to evaporate and produce a vapour. But as this is combustible,
it can be re-lighted at once by a naked flame. The experiment shows that solid
substances first become gaseous at the surface before they will burn in a
supply of
oxygen.
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