He has examined many examples of glass from old buildings, measuring their material properties and chemical composition. Some glasses, such as the leaded variety, have lower transition temperatures. For example, it's possible to take water from being a liquid to a gas at high pressure without its passing through a phase transition; so at some stage it must be between an ideal liquid and an hogtied bdsm naked gas.
A liquid to crystal transition is a thermodynamic one; i. Sometimes people say that good evidence that glass does not flow chubby pic provided by telescope lenses which after years still maintain excellent optical qualities. It is sometimes said that glass is therefore neither a liquid nor a solid. It has a distinctly different structure with properties of both liquids and solids. Glasses and supercooled liquids are both metastable phases rather than true thermodynamic phases like crystalline solids.
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It may be based on boro-silicate or soda-lime glass with other metallic oxides added to improve its thermal and optical properties. If it cools slowly it has longer to relax, the transition occurs at a lower temperature and the glass formed is more dense. They deform but return to their original shape when the stress is removed.
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