BUBBLES

How Long Will They Last?

BIG QUESTION

Which kind of bubble solution will hold a sharpened pencil the longest without popping?

HYPOTHESIS

The Magic Bubbles will last the longest with the sharpened pencil inside the bubble because bubbles made with purchased solution are harder to pop outside. They are stickier because they have glycerin.

RESEARCH

Water is made up of molecules. They stick together because hydrogen atoms in molecules are attracted to oxygen molecules. This is called surface tension. Surface tension creates bubbles in water. When you add soap the water becomes flexible. When you add soap to the water it relaxes and becomes more stretchy, like a balloon. When you add glycerin or corn syrup to the soapy water it becomes thicker. Water trapped between the layers of soap evaporates and it pops. To put a pencil into a bubble without the bubble popping, the pencil must be wet. The water molecules on the pencil are attracted to the molecules on the bubble and fill in the hole.

Sources

Home Science Tools – Bubble Science Projects
http://www.hometrainingtools.com/bubbles-and-surface-tension-science-projects/a/1508/

Science Buddies – Bubble-ology
http://www.sciencebuddies.org/science-fair_-projects/project_ideas/Chem_p025.shtml#background

Steve Spengler Science – Giant Bubble Experiment http://www.stevespanglerscience.com/lab/experiments/giant-bubble-experiment

MATERIALS

1. sharpened pencil

2. purchased Magic Bubbles - 1 cup

3. Dawn Dishwashing Soap - 1 cup and 1 cup water

4. a lid with an edge

5. a straw

6. a watch

7. homemade super bubble solution: 1 cup of dish soap, 6 cups of water, 1/4 cup corn syrup

8. meausring cup

PROCEDURE

Test 1

1. Make the homemade soap .

2. Fill the lid with homemade soap solution.

3. Wet the straw and put it in the solution and blow.

4. Slowly pull out the straw.

5. Wet the pencil and put it slowly into the bubble.

6. Time it to see how long it lasts.


Test 2

1. Mix the dishwashing soap with water.

2. Fill the lid with the dishwashing soap solution.

3. Wet the straw and put it in the solution and blow.

4. Slowly pull out the straw.

5. Wet the pencil and put it slowly into the bubble.

6. Time it to see how long it lasts.


Test 3

1. Fill the lid with the purchased Magic Bubbles.

2. Wet the straw and put it in the solution and blow.

3. Slowly pull out the straw.

4. Wet the pencil and put it slowly into the bubble.

5. Time it to see how long it lasts.

RESULTS/CONCLUSIONS

The homemade soap lasted longer. I believe that the corn syrup must be stickier than the glycerin in the Magic Bubbles. It stuck tighter to the pencil. I should have known that because syrup is so sticky. My hypothesis was not correct.