Tuesday, September 8, 2009

Sink/Float

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Most candy sinks in water, because sugar is denser than water.  But some candy floats.  Why?




One candy bar floats; one sinks.

What you need:
  • Different kinds of candy, such as chocolates, sugar candy, 3 Musketeers bar, Kit Kat bar
  • water
What to do:
  1. Drop the candy in the water.
  2. Watch what happens: does it sink or float?
  3. If you have a 3 Musketeers bar, poke it to break the chocolate shell.  Do you see bubbles escaping?


What’s happening:
Some kinds of candy, such as Kit Kats, 3 Musketeers, and marshmallows have air trapped inside.  This makes them float. 


Find a Sink and Float experiment worksheet created by Science Gal at her website here!

4 comments:

  1. What a cool way to teach density and buoyancy with every day stuff:)

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  2. I will use this for the end of the year exam reviews. I'm always looking for new Density demos.

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  3. I did this for my 6th graders as part of a science circus (various stations going at once) to study matter and its physical properties. I had 4 cylinders - 2 with oil, 2 with water. We used 3 Musketeers and Twix. We did the experiment for each candy type (one in oil, one in water). It was fun to see their amazement at the activity. It got them thinking about what other liquids and candies they could try for more results to observe.

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  4. That sounds so fun! Let me know if they make any candy discoveries.

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