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Polymethyl methacrylate is clear.
because 2-butanone is a mixture so ethanol and water do not but mixtures do.
Poly(methyl methacrylate) or PMMA is commonly reffered to as acrylic or acrylic glass. So generally, they're the same thing.
Hard contact lenses are made of a plastic polymer called polymethyl methacrylate.
Plastics can be designed to be very brittle or very tough and flexible. Polymethyl methacrylate is quite brittle for example.