schoolscienceproject.blogspot.in
Curious air
currents
If you stand
behind a tree trunk or a round pillar on a windy day, you will notice that if
offers no protection, and a lighted match will be extinguished. A small
experiment at home will confirm this: blow hard against a bottle which has a
burning candle standing behind it, and the flame goes out at once. The air current
divides on hitting the bottle, clings to the sides, and joins up again behind
the bottle with its strength hardly reduced. It forms an eddy which hits the
flame. You can put out a lighted candle placed behind two bottles in this way,
if you have a good blow.
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