What can be inferred about SPF values?
Understand the Problem
The question is asking about the meaning and implications of SPF values in sunscreen, specifically which statements can be inferred based on knowledge of SPF.
Answer
SPF measures sunscreen's effectiveness against UVB rays; higher SPF offers more protection.
Sun Protection Factor (SPF) values indicate the effectiveness of a sunscreen in protecting the skin from UV radiation, specifically UVB rays. Higher SPF values mean more protection, with SPF 30 allowing 1/30 of the UV radiation to reach the skin, while SPF 50 allows 1/50.
Answer for screen readers
Sun Protection Factor (SPF) values indicate the effectiveness of a sunscreen in protecting the skin from UV radiation, specifically UVB rays. Higher SPF values mean more protection, with SPF 30 allowing 1/30 of the UV radiation to reach the skin, while SPF 50 allows 1/50.
More Information
SPF stands for Sun Protection Factor and helps assess how well a sunscreen can protect the skin from UVB radiation, which causes sunburn. While a higher SPF provides more protection, no sunscreen can block 100% of UV rays.
Tips
One common mistake is thinking that SPF 30 offers double the protection of SPF 15; it actually only blocks slightly more UVB rays but lasts longer.
Sources
- What does the SPF rating really mean? - Curious - science.org.au
- Sun Protection Factor (SPF) - FDA - fda.gov
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