This depends. “Glass” is most commonly made up of sodium carbonate or nitrate, silica, and lime. It can certainly exist in a liquid state, if the temperature is high enough. Average melting points for common compositions of glass range between 1425 and 1600 degrees Celsius. Glass existing at any temperature lower than that will genrally be considered a solid, as it has definite shape and volume. Windows, vases, and bottles are all examples of glass as a solid.
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