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A bottle with a narrow neck
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Vinegar
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Baking soda
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Funnel or straw
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Water
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Balloon
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Stretch the open end of the balloon over
the neck of the bottle. Make sure it's on tight! Let the heavy end of the
balloon dangle, so no baking soda goes in the bottle.
Hold onto the ballon at the bottle neck,
and pick up the heavy part of the balloon so that all the baking soda falls
into the vinegar at the bottom of the bottle.
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Wow! Hear the fizz? There are thousands of bubbles! And look
at what's happening to the ballon...
For more bubble fun you'll need:
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A can of clear soda (7-Up, Ginger Ale)
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Raisins
Get a can of clear soda and shake
it as hard as you can. Knock sharply on the top two or three times. Now
open it. Or give it to a grown-up to open, if you dare. (This may be messy-so
do it over the sink or outside.) What happens? What did you expect?
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Now that your can of soda is open, pour it into a glass. Drop in five or
six small raisins. Watch tiny bubbles form all over them. In a minute or
so, the raisins will start to wiggle around and dance. Then they'll float
up to the top of the soda. After a minute, they'll sink back down again.
If you tap on the side of glass, they'll sink right away. How long will
they keep dancing?
Fizzy liquids get into your intestines faster than other liquids. The bubbles
in soda or Alka-Seltzer tickle the exit valve in your stomach, and it opens.
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This and dozens of other cool activities are included
in the Exploratorium's Science Explorer books, available for purchase
from our
online
store
.
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Published by Owl Books,
Henry Holt & Company, New York,
1996 & 1997
ISBN 0-B050-4536
&
ISBN
0-8050-4537-6
,
$12.95 each
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© 1998
Exploratorium
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