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Hey guys, so I just wanted to talk quickly about the chemistry of sunscreen to help you
better understand why it is necessary to wear it everyday. So I'm just going to start off
talking a little bit about UVB rays because those are better known. UVB rays are the ones
that cause burning and these are measured in sunscreens by the SPF. So the stronger
the SPF the more percent it protects against UVB rays, but more chemistry related is the
way that sunscreens are able to block against UVA rays. So sunscreens are able to block
against UVA rays by using certain chemicals that are able to absorb or reflect certain
rays, UVA rays. Um. You must protect against UVA rays because you want to avoid looking
like this, but also because UVA rays interact directly with your cells and they cause very
dangerous mutations of the DNA in your cells. So it is very important to not get exposure
to UVA rays so you have a less likely chance of getting skin cancer! Um. SO the reason
that the 2 chemicals, titanium dioxide and zinc oxide are so common in sunscreens is
that they not only do a great job of reflecting UVA rays or absorbing them, but they are non-allergenic
and nonirritating because they are not absorbed into the skin, they sit directly on top of
it. Which is why it is important to reapply regularly, recommended every 2 hours. Um.
Both chemicals are ionic bonds because they respectively form a bond between a metal and
a nonmetal. Next time you are buying sunscreen, check the labels to find zinc oxide or titanium
dioxide. Check out my tumblr, my twitter and my website, which I'll link right here. And
also check out my other youtube videos on this channel. I hope you guys enjoyed, and
I'll talk to you guys soon! Bye guys!