BRIAN BELL / SCIENCE PHOTO LIBRARY BRIAN BELL / SCIENCE PHOTO LIBRARY
Glass manufacture. Worker adjusting a sheet of glass supported on rubber-covered springs and underlit by strip lighting. Glass is an amorphous, transparent solid produced by cooling a molten mix of silica (silicon dioxide, as in sand), soda (sodium carbonate) and lime (calcium oxide). Sheet glass is used in windows. This is fire glass, a form of glass that is strengthened to resist the high temperatures of a fire.
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