The film traps air in the center, causing the bubble to retain its spherical shape until it pops. The addition of soap to the water is important. The reason why bubbles only really hold their shape when made with soapy water is that the soap stabilizes the surface of the bubble. The soap decreases the bubble's surface tension, which allows it to stretch and hold its shape.
Read more: How Bubbles Are Made | eHow.com http://www.ehow.com/how-does_4912993_how-bubbles-made.html#ixzz1255pS7vi
Which substance would affect the bubble-blowing solution?
Hypothesis
I hypothesize that the salt mixture will prevent bubble production.
Materials
- 3 Plastic Drinking Cups
- Liquid Dish Detergent
- Measuring Cup and Spoons
- Water
- Table Salt
- Table Sugar
- Drinking Straw
Procedures
1. Label three drinking cups 1, 2, & 3 measure and add one teaspoon of liquid dish detergent to each cup. Use the measuring cup to add two thirds of a cup of water to each drinking cup. Then swirl the cups to form a clear liquid.
2. Add a half teaspoon of table sugar to cup 2 and a half teaspoon of table salt to cup 3. Swirl each cup for 1 minute.
3. Dip the drinking straw into cup 1, remove it, blow gently into the straw to make the largest bubble you can. Practice making bubbles until you feel you have reasonable control over your bubble production.
4. Repeat Step 3 with the mixtures in cups 2 & 3.
Data
The bubbles that had salt mixture did not grow as big as other bubbles. With the sugar mixture we found that the production increases as the normal bubble mixture kinda worked.
Discussion
What we learned from the bubble lab is that some substances help the bubbles production and some hinder them. This can be used to entertain children.
Conclusion
Our hypothesis was that the sugar in the bubble mixture would make the bubbles bigger. Our hypothesis was correct because the tests we did the sugar bubble mixture produced bigger bubbles.
