does a small flame on a candle go out when you blow on it? Does the wind
just "blow" it out, or is there something in the gas? If we
exhaled pure oxygen, the flame would get larger, but because we exhale
carbon dioxide, it suffocates the flame. Can you create a way to
capture carbon dioxide and help extinguish the flames?
Put your thumb on an empty bottle then blow as
hard as you can to trap exhaled air rich in carbon dioxide. Rapidly
cover the opening. Aim the bottle at the candle flame and quickly remove
your thumb. The "puff" puts out the flame.
Light the candle again and hold the bottle between
your mouth and flame. The bottle is in the way of the carbon dioxide, so
why does the flame go out this time. The air moving past the bottle
creates a partial vacuum behind the bottle (no oxygen) and the
air rich in carbon dioxide rushes in to fill the vacuum and puts out the