Glass (material): nm Two definitions of “glass” can be distinguished. The first is the common-sense definition: Glass is a hard, brittle (brittle) material or alloy that is transparent to visible light, based on silicon oxide (silica SiO, the main constituent of sand) and fluxes : this is the case of soda-lime glass used for glazing. This common definition was the definition also adopted by the scientific community a century ago. That is...
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