| 单词 | glass |
| 释义 | glass An amorphous solid in which the atoms form a random network. Glasses do not have the rigidity of crystals and have a viscosity that increases as the temperature is lowered. At very low temperatures, when the viscosity is very large, glasses can become elastic and brittle. Because the simplifications that can be applied to a periodic system are not applicable it is more difficult to construct theories relating to the properties of glasses than it is for regular crystals and crystals with isolated defects. At the present, a fully quantitative theory of the properties of glasses, particularly those properties that are distinct from the properties of crystals, does not exist. Because glasses consist of a random network it is usually necessary to use statistical methods to discuss their properties. Experimentally, a glass is a disordered solid with nonzero shear (rigidity) modulus and a viscosity greater than 1013 poise |
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