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Conclusion

The hypothesis that soap bubble solutions containing glycerin will last the longest is proven to be correct.

Bubble solutions are normally made of a combination of water, detergent and glycerin. Glycerin is a thick, clear and odorless substance that is a byproduct of the soap-making process. Adding glycerin to the bubble solution will help to increase the lifespan of the bubble. When dissolved in the bubble solution, glycerin forms a weak bond with hydrogen, that helps to delay the evaporation of the water layer in the bubbles.

Blowing and playing with soap bubbles is very entertaining for children and adults. It is a very inexpensive and good way to spend quality time with children. The market for soap bubble toys is also growing. New  battery operated bubble producing devices are constantly being developed. These devices are able to produce larger bubbles, at a much faster rate. Bubble solutions that produce longer-lasting bubbles are also being invented. Imagine a bubble that does not burst upon impact with solid objects! That would be lots of fun!

Also consider

Repeat the above science fair project using other additives like vinegar or salt.

Try to compare the results by repeating the experiment at different room temperatures.

Would the humidity of the air affect the size of the bubbles, and how long they last?
 

References

Soap bubble - http://en.wikipedia.org/wiki/Soap_bubble

Soap bubble - http://scifun.chem.wisc.edu/HomeExpts/SOAPBUBL.html

How does glycerin make bubbles last longer - http://www.ehow.com/how-does_5421403_glycerin-make-bubbles-last-longer.html
 

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Complexity level:
3
Project cost ($):
20
Time required:
1 hour to prepare, 1 hour for science fair project
Material availability:
Very easily found at any supermarket or grocery store
Safety concerns:

None