What is SPF in sunscreen mean?

Related questions

1. Is oxybenzone in sunscreen dangerous?
2. Is sunscreen safe to use everyday?
3. Is SPF 70 sunscreen good?
4. Can sunscreen give you cancer?
5. Is the sunscreen truly chemical free?
6. Is SPF 100 better?
7. Is PA +++ broad spectrum?
8. Which SPF is best?
9. What's the bad ingredient in sunscreen?
10. Is there a difference between sunblock and sunscreen?

Tags

1. #chief
2. #sunscreen
3. #damage
4. #dangerous
5. #sunburn
6. #cancer
7. #protection
8. #where
9. #occur
10. #forms
11. #least
12. #protect
13. #factor
14. #outer
15. #reddening
16. #layers
17. #epidermis
18. #cause
19. #measure
20. #relative
21. #common
22. #ultraviolet