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Wind funnel
Light a candle
and blow at it hard through a funnel held with its mouth a little way from the
flame. You cannot blow out the flame; on the contrary it moves towards the
funnel. When you blow through the funnel the air pressure inside is reduced,
and so the air outside enters the space through the mouth. The blow air sweeps
along the funnel walls: if you hold the funnel with the edge directly in front
of the flame, it goes out. If you blow the candle through the mouth of the
funnel, the air is compressed in the narrow spout, and extinguishes the flame
immediately on exit.
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