Glass melting definition

Glass fiber (1882) n. A manufactured fiber in which the fiber-forming substance is glass (FTC definition). In the continuous filament process, glass marbles are melted in... 

It is a white, deliquescent solid, very powdery, which exhibits polymorphism on heating, several different crystalline forms appear over definite ranges of temperature -ultimately, the P4O10 unit in the crystal disappears and a polymerised glass is obtained, which melts to a clear liquid. 

At the macroscopic level, a solid is a substance that has both a definite volume and a definite shape. At the microscopic level, solids may be one of two types amorphous or crystalline. Amorphous solids lack extensive ordering of the particles. There is a lack of regularity of the structure. There may be small regions of order separated by large areas of disordered particles. They resemble liquids more than solids in this characteristic. Amorphous solids have no distinct melting point. They simply become softer and softer as the temperature rises. Glass, rubber, and charcoal are examples of amorphous solids. 

Oleum.—Oleum is supplied in all strengths up to 70% free S03. From 0—40% free S03 it is liquid from 40—60% free S03 it is solid from 60—70% free S03 it is liquid above 70% it is solid. The acid should be kept in well-stoppered, stout glass bottles, and when it is necessary to melt the acid, the stopper is withdrawn, a watch-glass placed on the mouth of the bottle, and the bottle placed on a layer of sand in a large vessel or oil bath which is warmed with a small flame. The bottle is fitted with a wash-bottle attachment, and any desired quantity is forced out by gentle air pressure from hand or foot bellows (the mouth must not be used). For the preparation of oleum of definite strengths, see p. 314. Usual impurities ferric sulphate, sulphur dioxide and lead sulphate. For estimation, see p. 313. 

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