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Krampf #469 More Foam...and less
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KRA-@aol.com
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Nov 02, 2006 07:50 PST
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Robert Krampf's Experiment of the Week
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This Week's Experiment - #469 More Foam...and Less
Greetings from Ft. Myers, Florida. Nancy and I are here for another week of
shows for Florida Power and Light. Along the way, we are having a blast on
the beach. We are minutes away from world famous Sanibel Beach, with all of
its incredible shells. Just a bit further is the Ding Darling National
Wildlife Refuge, where we photographed all sorts of wildlife. Add in all of the
wonderful food, the beautiful sunsets and some great walks on the beach, and
you can see why we are having a blast.
This week's experiment comes from Kaitlin, Cody and Jenna Russell. They
wrote to tell me that they made a very interesting discovery about how the order
that you add ingredients makes a big difference. To try this, you will need:
carbonated soda
ice cream
two glasses
Lets start by recreating their experiment. Does it make a difference which
ingredient you add first? Put a scoop of ice cream into one glass. Pour
some carbonated soda into the other. Now, lets compare the difference. Add
some soda to the glass with the ice cream. Try to add the same amount of soda
that you put into the other glass. Watch carefully, to see what happens and
how much foam you get.
Next, add a scoop of ice cream to the glass with the soda. Again, watch
carefully. This glass has quite a bit less foam. Why?
In the glass where you added the soda first, the soda produced foam all by
itself. If you watched carefully, all this foam vanished when you added the
ice cream. Even a tiny bit of ice cream added to the soda will cause all the
foam to go away. The proteins from the ice cream change the surface tension,
so they actually destabilize the old bubbles as they stabilize the new ones.
Part of our foam is going away as the rest is forming.
Adding the ice cream causes the carbonation to leave the soda very quickly.
Once you have some ice cream mixed in with the soda, you will notice that it
is totally "flat," with no carbonation left. If part of that carbonation has
already come out before the ice cream was added, there will be less gas
left to form bubbles, so you will get less foam. If you totaled all the
bubbles, both before and after the ice cream, you would get the same amount as if you
had added the ice cream first. Now that you know what to watch for, you
will probably want to do the experiment again, after you finish eating the first
one.
Have a wonder filled week!
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From Robert Krampf's Science Education Company
PO Box 60982
Jacksonville, FL 32236-0982
904-388-6381
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