
• A clepsydra. • An instrument consisting of an open box or tube with a glass bottom, used for examining objects in the water, as upon the sea bottom in shallow places. • A water gauge for a steam boiler. • See Soluble glass, under Glass.
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crystal-like lumps that range from colourless to white or grayish white and resemble glass but can be dissolved in water to form a syrupy liquid. ... [4 related articles]
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http://www.britannica.com/eb/a-z/w/13

Crystal garden grown using water glass Image credit: S. Horbury An aqueous solution of sodium silicate (Na
2SiO
3) – a concentrated, syrupy alkaline – made by fusing sodium carbonate with silica. It is used to preserve eggs, as a cement, i...
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Wa'ter glass` (Chemistry) See
Soluble glass , under
Glass .
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http://www.encyclo.co.uk/webster/W/12
Water glass 1. A clepsydra.
2. An instrument consisting of an open box or tube with a glass bottom, used for examining objects in the water, as upon the sea bottom in shallow places.
3. A water gauge for a steam boiler.
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Type: Term Synonyms: soluble glass
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http://www.medilexicon.com/medicaldictionary.php?t=37384

Water-glass or soluble glass is an aqueous solution of sodium or potassium silicate. Upon exposure to the air water-glass solidifies, and is used for painting frescoes, as a fire-retardant paint and for pickling eggs.
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Sodium silicate
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[
n] - a glass for drinking water
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Common name for sodium silicate. See deflocculent.
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https://ashbrook-ceramics.co.uk/pottery-glossary/

The water glass is mounted to the water column and has a series of vertical buttons which change color from green to red to indicate the level of water in the column. Green represents water and red indicates steam. This allows for visual observation of the water level in the boiler at all times.
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noun a glass for drinking water
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https://www.encyclo.co.uk/local/20974

Common name for sodium metasilicate (Na
2SiO
3). It is a colourless, jellylike substance that dissolves readily in water to give a solution used for preserving eggs and fireproofing porous materials such as cloth, paper, and wood. It is also used as an adhesive for paper and cardboard and in the manufactu...
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https://www.encyclo.co.uk/local/21221
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