Help make Alexa smarter on Alexa Answers. Sign in with Amazon

Science

How does spf work?


sun protection factor, or SPF, measures the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that ​one fifteenth of the burning radiation reaches the skin through the recommended thickness of sunscreen.

{{ relativeTimeResolver(1579825156561) }}

LIVE
Points points 17
Rating

Similar Questions
Sign in to view all similar questions
Science 3 Answers
Science 1 Answer
Science 1 Answer

Join Alexa Answers

Help make Alexa smarter and share your knowledge with the world

LEARN MORE