UV Radiation: Sunscreen SPF Experiment
Students learn how to prevent exposure to the sun's ultraviolet rays. Students systematically test various sunscreens to determine the relationship between SPF (sun protection factor) value and sun exposure. At activity end, students are asked to consider how their investigation results could be used to help them design a new sunscreen.
Sunscreen helps to protect skin from the sun's UV rays.Copyright VA Pacific Islands Health Care System, U.S. Department of Veterans Affairs http://www.va.gov/hawaii/images/clip_image002_0000.jpg
Engineers play a vital role in the design of sunscreen and other protective equipment that shield us from the harmful rays of the sun. Chemical engineers test and decide what chemicals best make up sunscreen products in order to achieve the desired ultraviolet (UV) protection. In addition, engineers contribute to the design of materials that are used for sunglasses and clothing that blocks the sun, as well as medical technologies used to treat skin cancer, including medicines and equipment.
After this activity, students should be able to:
- List and describe the types of UV radiation.
- Describe the importance of sunscreen and other protective equipment to block the sun's rays.
- Correlate sun exposure to SPF value of sunscreen.