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# Bubbles

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```									         Bubbles
Multimedia Science Fair Project
Heather Kravitz
Question:
Why is a bubble round?
Hypothesis:
A bubble is round
because it is full
of air.
Materials:
•Bottle of bubbles
•Bubble blower
Procedure:
1.) Remove lid of bubble
solution container
2.) Insert bubble blower
(wand) carefully into the
solution
3.) Remove blower and
blow into the center of
the film of bubble
solution
4.) Watch how a bubble is
formed and created
5.) Repeat
Caution:
Do not try outside on a windy
day. A sudden gust might blow a
bubble backwards into your
mouth and you might eat it.
Results:
Bubbles are definitely
round.
Conclusion:
So why are bubbles round?
• Following our trials, it
appears the answer is
surface tension and
volume of air.
• The air inside the bubble
is pushing out while the
surface tension is pushing
in which creates a
balance.
• The bubble’s round shape
is the smallest amount of
surface area a bubble can
have for the amount of air
it has inside it.
Perimeter:
If we look at the                Perimeter of Different Shapes

perimeter of different       5
Circle
shapes with a fixed area,    4                               Square
Triangle
we see that the circle has   3                               Rectanle
the smallest perimeter.      2

1
If you imagine cutting a
bubble in half, it would     0

be a circle. Therefore, a
circle is the smallest
shape a bubble could be.
BUBBLE SOLUTION RECIPE
and WAND CONSTRUCTION TIPS:
What you need:
• good quality liquid dish soap
• glycerin
• shallow pan or a large dish
• misc. wand making materials such as
wire, straws, netting, string, your
hands...
What you do:
• Mix your bubble solution (make lots and
store some. The older the mixture the
better it seems to work.) Use about 1 cup
of soap and about 1 tsp. of glycerin to a
quart of water.
• Make different shaped wands. Be creative
and experiment with many shapes and
utilizing different materials.
• Method tips: Dip your wand into the
solution and gently wave with full arm
motion. Vary the speed of movement and
try blowing into the soap film too!
To learn more about bubbles go to:
• http://simscience.org/membr
anes/intermediate/essay/why
_bubbles_round1.html
• http://ksnn.larc.nasa.gov/we
btext.cfm?unit=bubbles
• http://www.kids-science-
experiments.com/cat_surface
tension.html
• http://www.hobbyscience.co
m/bubble.html
• http://www.bubbleblowers.com
/index.html
• http://homepage.mac.com/keit
hmjohnson/soapbubbler.com/i
ndex.html
The End

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