Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Other types of glass are made by adding other chemical compounds. Adding boron oxide causes some silicon atoms to be replaced by boron atoms, resulting in a tougher glass that remains solid at high temperatures, used for cooking utensils and scientific apparatuses. Published by Houghton Mifflin Harcourt Publishing Company.a hard, brittle, noncrystalline, more or less transparent substance produced by fusion, usually consisting of mutually dissolved silica and silicates that also contain soda and lime, as in the ordinary variety used for windows and bottles.any artificial or natural substance having similar properties and composition, as fused borax, obsidian, or the like.something made of such a substance, as a windowpane.a tumbler or other comparatively tall, handleless drinking container.a device to compensate for defective vision or to protect the eyes from light, dust, and the like, consisting usually of two glass or plastic lenses set in a frame that includes a nosepiece for resting on the bridge of the nose and two sidepieces extending over or around the ears (usually used with a hard brittle transparent or translucent noncrystalline solid, consisting of metal silicates or similar compounds. All rights reserved.The American Heritage® Idioms Dictionary Published by Houghton Mifflin Company.The American Heritage® Science Dictionary monter translation in French - English Reverso dictionary, see also 'se monter',mont',monte',monté', examples, definition, conjugation
The glass used in windows and windshields, called soda glass, is made by melting a silicate with sodium carbonate (soda) and calcium oxide (lime). Glass used for decorative purposes often has iron in it to alter its optical properties. Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass-making cultures. The raw materials for laboratory-scale glass melts are often different from those used in mass production because the cost factor has a low priority. Thus, glass-ceramics have become extremely useful for countertop cooking and industrial processes. Glass definition, a hard, brittle, noncrystalline, more or less transparent substance produced by fusion, usually consisting of mutually dissolved silica and silicates that also contain soda and lime, as in the ordinary variety used for windows and bottles. The "glass ceiling" metaphor has also been used to describe the limits and barriers experienced by … © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Glass ceiling definition is - an intangible barrier within a hierarchy that prevents women or minorities from obtaining upper-level positions. For other uses, see Wilde, H. "Technologische Innovationen im 2. Definition. Archaeological evidence suggests glass-making dates back to at least 3,600 BCE in For melt quenching, if the cooling is sufficiently rapid (relative to the characteristic Glass is sometimes considered to be a liquid due to its lack of a first-order Throughout the 20th century, new mass production techniques led to the widespread availability and utility for bulk glass and its increased use as a building material and new applications of glass.In the 21st century, glass manufacturers have developed different brands of chemically strengthened glass for widespread application in Glass is in widespread use in optical systems due to its ability to refract, reflect, and transmit light following In the manufacturing process, glasses can be poured, formed, extruded and moulded into forms ranging from flat sheets to highly intricate shapes.The density of glass varies with chemical composition with values ranging from 2.2 grams per cubic centimetre (2,200 kg/mThe observation that old windows are sometimes found to be thicker at the bottom than at the top is often offered as supporting evidence for the view that glass flows over a timescale of centuries, the assumption being that the glass has exhibited the liquid property of flowing from one shape to another.The most commercially important property of glass-ceramics is their imperviousness to thermal shock.