4M Волшебные пузыри (00-03351) [3/9] Why are bubbles round
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4M Волшебные пузыри (00-03351) [3/9] Why are bubbles round

4M Волшебные пузыри (00-03351) [3/9] Why are bubbles round
D. BASIC BUBBLE FUN
Materials required from the kit: bubble tray, bubble
solution, star wand, round wand, clip-on wand handles.
1. Pour some bubble solution into the small cavity of
the bubble tray.
2. Clip wand handles onto the round and star wands.
3. Dip a wand into the bubble solution, then lift it out
and shake off any excess solution.
4. Blow through the wand to make bubbles. Blow gently
to make a larger bubble, and blow a bit harder to make
a stream of smaller bubbles.
Can you make a star-shaped bubble with the star-
shaped wand? Why not?
E. MAGIC PAPER WAND
Materials required from the kit: bubble tray, bubble
solution, mouthpiece, and long straw.
Materials required from home: 2 x A4-sized sheets of
paper (e.g. photocopier or printer paper), sticky tape,
and scissors.
1. Place one paper sheet on top of the other and line
up their edges.
2. Starting at one of the narrow sides of the paper,
roll the paper into a narrow cone. Roll one edge of the
paper very tightly and the other edge less tightly. You
should end up with a cone with one pointed end and
one end about 4 cm (1.6 inches) across.
3. To stop the cone unrolling, stick down the edge of
the paper about halfway along the cone.
4. Carefully snip off the narrow end of the cone to leave
an opening about 1.5 cm (0.6 inches) across.
5. Carefully trim the wide end of the tube to leave a
neat circle. Trim away any rough edges.
6. Push the plastic mouthpiece onto the narrow end
of the tube, tightly enough that the tube stays in place
when you hold up the mouthpiece. That’s the paper
wand complete.
7. Pour some bubble solution into medium cavity of the
bubble tray. Now you’re ready to blow some bubbles
with the neat magic paper wand!
1 1
7
2 2
3
4 6
3
5
4
4 5
4cm
Why are bubbles round?
Single bubbles are always a round
shape (called a sphere). This is because
the skin of a bubble always tries to shrink
to the smallest surface area possible to
contain the air inside it. When you blow
a giant bubble, you can see that it slowly
turns from a wobbly shape into a sphere.
When two bubbles stick together, they
keep making smallest surface area,
which is why you see flat walls
between the bubbles.
1.5cm wide
2 x A4 paper

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