Instructions Bend pipe cleaners to form a cube. Leave a little bit out at one corner as the handle. Fill the container with water deep enough for the cube you just made to submerge completely.
Add liquid dish soap into the water. Add glycerin to the mix. Submerge the cube into the water entirely and then lift it up. Shake the cube gently from side to side to get different shapes of bubbles formed inside.
Observe how the shapes of bubbles are different from those of free flying bubbles. Notes There is another way. After the Experiment Why did we need to create a cube shape for the wand and not just a 2D square? A 2D square wand would just create one bubble. Any frame that creates a solitary bubble will produce spherical bubbles! What other types of bubble shapes do you think you can make? How it works A free flying bubble, made with a flat two-dimensional 2D wand shape will always be round.
Key Words Adhesion The molecular attraction that holds the surfaces of two dissimilar substances together. Air Pressure The force exerted by air, whether compressed or unconfined, on any surface in contact with it. Atom The tiny particles called atoms are the basic building blocks of all matter Cohesion A physical property of a substance, caused by the intermolecular attraction between like-molecules within a body or substance that acts to unite them.
Force An influence on a body or system, producing or tending to produce a change in movement or in shape or other effects Surface Tension A force present within the surface layer of a liquid that causes the layer to behave as an elastic sheet. Surface tension is caused by the attraction between the molecules of the liquid. Water Molecule The smallest unit of the substance of water that contains all properties of water.
A water molecule can be divided into tiny parts called atoms. This is because there is excess air pressure inside the walls of the bubbles. Use their knowledge of soap films and minimal surface structures to make bubbles of various sizes, shapes, and arrangements.
Per Group:. Per Student: 1 3-D bubble wand 1 straw various materials to make 3-D bubble wands optional. Why does a 3-D frame make a difference to the shape of a bubble? Does the frame create a bubble of the same shape when you dip it into the solution? What does it create? What happens when you try to release your cube bubble into the air? What role does surface tension play? Details Activity Length 15 mins.
You can test this by making your own bubble wands in different shapes. We used pipe cleaners and straws. Strong bubble mix — this recipe from Red Ted Art is great. The forces acting between the molecules of the bubble cause it to form the shape that encloses the most volume with the least surface area — a sphere. That is why when you try to blow a bubble through a shaped wand it still becomes a circle. When the light shines through the bubble film it is reflected and dispersed, which splits it into different wave lengths and showing all the colours.
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