Blowing through a Bottle
Can you blow hard enough to make your breath pass right through a thick glass bottle? The majority of people will say “No,” and dare you to perform the task. It is really very easy.
Take a large round bottle or jam jar, and place a lighted candle behind it, as in [Fig. 10]. Now stand so that the bottle or jar is interposed between yourself and the light, and blow. The flame will be extinguished at once!
There is scarcely need to tell your surprised friends that the shape of the bottle has really caused your breath to follow the curve of the two sides, unite at the back, and blow out the light.
Fig. 10.—How the candle flame is extinguished.