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This
activity was created by Exploratorium staff.
What
You'll Need:
- A small
clear plastic bottle with a tight-fitting cap--the more rounded the
bottle, the better.
- Liquid
hand soap that has glycol stearate in it (such as Colgate-Palmolive's
Softsoapİ). Any brand with glycol stearate will work--check the
ingredients on the label.
- Food
coloring
- Clear
tape
Procedure:
Step 1:
Fill the bottle about 1/4 full with liquid
soap.
Step 2:
Add a drop or two of food coloring.
Step 3:
Turn on your faucet so you have just a trickle of
water. Use that to fill up the rest of the bottle. (If you you the water
too hard, you'll get foam.) Make sure to fill the bottle all the way to
the very top.
Step 4:
Screw the cap on the bottle upside-down a few times
to mix the soap and water. If you get foam, take the cap off and trickle
some more water into the bottle. The foam will run over the edge. Recap
the bottle tightly.
Step 5:
Dry the bottle, then wrap clear tape around the top
so the bottle won't leak.
Step 6:
Twirl and shake the bottle to see smooth streaks and turbulent swirls.
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