1. Place your
candle just behind round/cylinder
container/object. This could
be a large soda bottle.
2. Light the candle.
3. Blow against the round container
from the front and at candlelight
did you think would happen?
works the same with liquids.
The fluid or air tends
to flow (follow) the contour of
the round container.
flow of air meets on the other side
of the container, they join together
to blow out the candle.