| For years I taught about density as well
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| | of carbon dioxide. To prove this just
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| as the properties of carbon dioxide,
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| | light another candle and slowly lower it
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| though never at the same time. Why it
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| | into the aquarium. It will extinguish
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| took so long to put the two together,
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| | itself once it gets below the aquarium's
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| I'll never know. Here then, are a few
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| | opening. In fact, the carbon dioxide
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| demonstrations involving the density of
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| | will rest in the aquarium for quite some
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| carbon dioxide gas and a flame. These
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| | time, especially if the room is
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| should be done by adults or under careful
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| | still.Another demonstration to try is to
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| adult supervision as there is a potential
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| | make a long trough out of V-shaped
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| of fire hazard.I suggest starting by
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| | aluminum foil and use it as a guide for
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| showing that air and carbon dioxide have
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| | pouring carbon dioxide. Place a candle
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| different characteristics. Hold a lit
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| | in a candlestick holder and light it.
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| candle in a glass for a few moments. It
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| | Place some baking soda and vinegar in a
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| keeps burning. Now place a small amount
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| | large bottle and let the bottle fill with
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| of baking soda in the glass and pour in a
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| | carbon dioxide. Now, hold the aluminum
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| bit of vinegar. What do the kids see
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| | foil trough so that one end is just above
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| happening (bubbles) and what do they
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| | the candle flame. The other end is held
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| think is happening (gas is produced)?
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| | higher. If water was added to the
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| Now lower the lit candle into the glass
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| | trough, it would pour down and extinguish
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| and it will go out instantly (the gas
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| | the candle. We are going to do this with
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| does not support the burning of the
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| | the carbon dioxide instead. "Pour" the
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| candle).For the next part of the
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| | carbon dioxide from the bottle into the
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| demonstration you will need several
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| | higher end of the trough. The candle
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| candles of different height. You will
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| | flame will flicker and usually extinguish
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| want as many different heights as
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| | at the lower end of the trough. Why?
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| possible so some candles may be broken,
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| | (The carbon dioxide, being more dense
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| some placed on supports such as
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| | than air, actually does pour down the
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| candlestick holders, inverted coffee
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| | trough. Once it reaches the other end,
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| cups, etc. I always hold these candles
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| | it pours out of the trough and over the
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| in place by lighting one and allowing the
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| | candle flame. Since the gas does not
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| hot wax to drip onto the surface where I
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| | support combustion, the flame flickers
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| want a candle to be placed. I then place
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| | and goes out.) This should re-instill
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| the bottom end of the candle in the wax
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| | the idea that carbon dioxide is more
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| and allow the wax to harden. The candle
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| | dense than air, as well as the fact that
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| will be "glued" in place by the cooling
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| | carbon dioxide does not support
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| wax. I have the candles / supports
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| | combustion.A final thought... if you
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| placed in the upright aquarium so that
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| | have easy access to affordable dry ice,
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| one corner remains open.Now, light all of
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| | it can be used in place of the baking
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| the candles. The effect should be quite
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| | soda and vinegar. It really is just
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| pretty, but that is not the purpose.
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| | carbon dioxide gas cooled and compressed
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| Place one cup of baking soda in the free
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| | into solid form. If you handle it, be
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| corner of the aquarium. To this add two
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| | sure to use gloves and tongs as it can
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| cups of vinegar. The familiar bubbling
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| | quickly and easily cause frostbite.Until
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| will occur. By watching the candles,
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| | next time... keep having fun with
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| something intriguing will be seen. They
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| | science!Thomas Smith owns and operates
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| will go out, one by one, from the candle
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| | Wonder Workshops, an online supply mecca
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| closest to the aquarium bottom to the
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| | of retro toys, puzzles, puppets, magic
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| uppermost candle. The reason? The
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| | tricks, books, novelties, and DVDs, all
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| carbon dioxide is more dense than air,
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| | based in science, math, and problem
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| therefore it rests below the air in the
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| | solving. Tom also presents hands-on,
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| aquarium. Since it is continually
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| | mind-on science workshops for teachers
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| produced, it pushes the air out of the
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| | and parents around the country. To find
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| aquarium so that it can remain below it.
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| | out more about the workshops and store,
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| If enough vinegar / baking soda are
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| | be sure to visit You'll be glad you
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| added, the aquarium will become brim full
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| | did!
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