Title, for example teeth fillings or glass glue. How or why is it getting hard / solid just with UV light?
Thanks!
In: Physics
It’s not necessarily that things harden especially readily in UV light, it’s that we select certain chemicals that do because it’s useful to us.
Something that hardens in UV will remain liquid in most conditions until we supply a relatively easy and safe source of UV.
Compounds that harden in visible light aren’t particularly useful to us, as they’d harden before we could use them.
Compounds that harden with difficult or dangerous components like another liquid, or radiation aren’t much use to us either.
Compounds that stay liquid until we supply a safe external stimulus are useful, so we see their application all around us
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