Fact No. 73. (Published on 3/23/2005)

Viscosity of Glass

[Viscosity of glass] refers to the state of fluidity of molten glass and reflects the internal friction amongst its particles and molecules. A glass which is stiff and difficult to work with is said to have a high viscosity whilst one which runs easily and is very fluid is said to have a low viscosity. The viscosity of a glass can usually be affected by heat.

- from Dictionary of Glass: Materials and Techniques by Charles Bray

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