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Target Grades: 4-8
Number of Students:‚ 24 students working in six groups of four
Students determine the relative effectiveness of sunscreens with different sun protection factor (SPF) ratings and compare their own sunscreens against the standardized samples provided using a laboratory procedure rather than actual human testing. Comprehensive instructor manual explains the different types of light waves, including the ultraviolet light (UV) categories; why UV light is harmful to skin; how sunscreens work; the biology of skin and how it protects us from UV radiation; molecular structures of common protective sunscreen ingredients; how Beer Law relates to sunscreens; and how SPF ratings are calculated. Includes sunscreen samples for SPF comparisons, but requires five additional commercial samples for testing.