analysis (see viscosity in solids). Though atomic motion at glass surfaces can be observed, and viscosity on the order of 10¹⁷-10¹⁸ Pa·s can be measured in glass, such a high value reinforces the fact that glass would not change shape appreciably over even large periods of time.

Formation from a supercooled liquid

For melt quenching, if the cooling is sufficiently rapid (relative to the characteristic crystallization

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