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Context UV light curing of glue is a process that uses ultraviolet (UV) light to rapidly harden or cure adhesives. This technology is used in many applications, from industrial manufacturing to dentistry, due to its speed and precision. However, the mechanism behind this seemingly instantaneous reaction is often unclear. This question delves into the specifics of how UV light interacts with glue to achieve rapid curing, addressing the apparent paradox of photons causing such a fast chemical change. Simple Answer Special molecules in the glue called photoinitiators absorb the UV light. This absorption gives the photoinitiators extra energy. The energized photoinitiators start a chain reaction. This chain reaction joins together the glue's smaller molecules into long chains. These long chains create a strong, solid glue. Detailed Answer The magic behind UV curing lies in specialized molecules added to the adhesive, known as photoinitiators. These photoinitiators are carefully design...

Context I was pulling Velcro apart in the dark and noticed it was emitting light as I did so. Can anyone explain this? Is it the same reason as adhesive strips/tape? Simple Answer Velcro is made of two strips, one with tiny hooks and the other with loops. When you pull them apart, these hooks and loops get separated and this creates friction. Friction generates heat, and in some cases, it can also generate light. This is called triboluminescence. Triboluminescence happens when certain materials rub against each other and create tiny electrical charges. These charges then get discharged, releasing energy as light. So, the light you see when pulling Velcro apart is due to triboluminescence. It's similar to the light you see when you break a sugar crystal or scratch a diamond. This is also the same reason why adhesive strips or tape sometimes emit light when peeled off quickly. It's all due to friction and triboluminescence. Detailed Answer The phenomenon of Velcro emitting light ...