Spf 30 facts
While investigating facts about Spf 30, I found out little known, but curios details like:
Sunscreen SPF is a very nonlinear metric. An SPF of 15 blocks 93% of incoming radiation, SPF 30 blocks 97%. SPF 50 blocks only 1% more than SPF 30, at 98%.
The sunscreen rating SPF 15 means 1/15th of the UV-B radiation is not blocked. SPF 30 means 1/30th, etc.
In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 5 of the best facts about Spf 30 I managed to collect.
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Glass absorbs 97% of UV rays meaning it's equal to SPF 30 sunscreen.
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Sunscreen SPF measures the fraction of UVB radiation that gets through. SPF 30 means 1/30 (3%) of radiation goes through, while SPF 50 means 1/50 (2%) goes through.
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th an SPF rating. SPF stands for sun protection factor to UV rays. If a product has a rating of 30, it means that 1/30th of the sun's burning radiation will be able to reach the skin. This includes applying sunscreen to 2mm thickness on the skin.
