- Wire Coat Hanger
- Two 1 liter plastic soda bottles
- Baking soda
- Pliers and Scissors
- Adult Supervision
Watch the Co2 Fire Extinguisher Video
Process For Making Your Own Co2 Fire Extinguisher
1) Use the scissors to cut off the tops of the plastic bottles.
2) Bend the coat hanger wire in a creative way to make a candle holder. Wrap one end of the
wire around the candle. Make a long straight piece with the rest and bend the opposite side for
a handle. Now you have a holder to lower your candle into the plastic bottle.
3) Light the candle and lower it into a soda bottle to prove it will not go out by itself when
lowered into one of the plastic bottles. Then blow out and remove.
4) Add three ounces of vinegar to one of the plastic bottles. Add one ounce tablespoon of
baking soda to the vinegar. A chemical reaction will occur and the mixture begin to fizz and
bubbles will appear. Carbon Dioxide gas has been created. Do not move the plastic bottle
when making the chemical reaction. Leave it still on the table.
5) Once the bubbling has stopped. Repeat step 3. It does not go out because the bottle has
enough oxygen inside to keep the flame burning.
6) Now this is the cool part. Pick up the bottle with the invisible Carbon Dioxide gas and pour it
into the other "empty" bottle. Be careful to not pour any liquid into the other container. You are
actually pouring an invisible gas!
7) Light the candle again and lower it into the container in which first held the Carbon Dioxide
gas (the one you mixed the vinegar and baking soda in, then poured out into the other). The
candle stays lit since you poured the gas into the other container.
8) Now lower the lit candle into the container in which you poured the Carbon Dioxide gas into.
The candle goes out and you have successfully transferred an invisible gas from one container
The Science Behind the Co2 Fire Extinguisher
A fire requires oxygen, fuel, and heat to burn. It's called the fire triangle. If any other these things
are missing it goes out. In this experiment we add carbon dioxide gas to the air surrounding the
flame, essentially depriving it of the oxygen it needs to burn. Carbon dioxide has a density
greater than air. Because of this it settles to the bottom of the plastic bottle once filled with air. It
does this by forcing the air up and out of the bottle. This property makes it simple to fill bottles,
beakers, or glasses with carbon dioxide and to pour it over the candle flame.
Carbon dioxide does not support combustion. When the air in the region of the flame is
replaced by carbon dioxide, the candle is extinguished. Carbon dioxide is used in some types
of fire extinguishers. It displaces the oxygen needed for combustion. Now go and make your
own Co2 fire extinguisher with your friends!
In this experiment we will make a fire extinguisher from carbon dioxide. Carbon dioxide
does not support combustion. When the air in the region of the flame is replaced by
carbon dioxide, the candle is extinguished. Carbon dioxide is used in some types of fire
extinguishers. It displaces the oxygen needed for combustion.
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