Materials:
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- Commercial bubble solution and wand
- 3-foot piece of string
- 3 plastic soda straws
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| Directions: |
- Puff method:
- Form a 3- to 5-inch bubble using the commercial bubble solution and either hold it on
your wand or release it so it gently floats in front of your face. When the bubble is 2 to
3 inches from your face and somewhat above you, blow a short blast of air into the side of
the bubble by making a "t" sound (the "p" sound is usually too
forceful and lacks control). To increase the force, simply close your mouth more. Practice
by holding your hand in front of your mouth and making both sounds to feel the difference.
Suggestion: Keep the bubble somewhat above you so you are blowing into the thicker portion
of the bubble as the bubble tends to thin at the top as the solution runs and collects at
the base.
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- Straw method:
- Dip the straw in solution and blow a few small bubbles. The first few you blow will not
be useful as the bubble wall will be too thick and will more readily join with the larger
bubble. Now, form a large bubble with a wand, quickly insert the straw into the large
bubble and blow gently, forming a bubble inside a bubble.
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- Wand method:
- Make a straw bubble frame using two straws and a piece of string. Blow a small bubble
out of the frame and quickly surround it with a larger bubble made from the remaining film
in the frame.
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| Safety Concerns: |
- You might want students to wear eye protection. There is the possibility that a bubble
could burst close to their face (getting soap solution in their eyes).
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| Questions: |
Can you blow a bubble in a bubble?
- Find other ways to get a small bubble inside a larger bubble.
- Stand back and let the investigations begin!
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| Concepts: |
- The bubble film at the "base" of the bubble is thick enough to allow you to
create another bubble, borrowing a bit of soap film from the first bubble.
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