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Sunscreen soap and UV radiationFeatured science projectScience project video

Conclusion

The hypothesis that  higher concentrations of Octyl salicylate in a soap mixture would result in greater blockage of UV radiation, has been proven to be true.

The use of sunscreens will block the UV-B and prevents sunburn but it may not necessarily be able to block the UV-A radiation. People who use sunscreen regularly risk overexposure to UV-A and increase their chance of getting a kind of skin cancer called melanoma. Moreover, using the sunscreen too often can also result in vitamin D deficiency.

Also consider

Would the results of our science fair project differ if it were to be  repeated using different types of sunscreen chemicals like oxybenzone or zinc dioxide?

The science project experiment can be also repeated using a UV lamp and performing the experiment indoors, for a more regulated amount of UV radiation.

References

Sunscreen - http://en.wikipedia.org/wiki/Sunscreen

Octyl salicylate - http://en.wikipedia.org/wiki/Octyl_salicylate

Why measure UV? - http://www.solatell.com/Why%20measure%20UV.htm

How to measure the UV index using the UV meter? - http://www.bom.gov.au/info/weatherkit/section2/pdf/uv.pdf

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Complexity level:
9
Project cost ($):
80
Time required:
1 hour to prepare, 1 hour for the science project experiment
Material availability:
May be found at a hardware store, and a chemist
Safety concerns:

Avoid long, unprotected exposure to the sun. Handle glass extremely carefully. Adult assistance required.