water glass

  1. A drinking glass or goblet.
  2. An open tube or box having a glass bottom for making observations below the surface of the water.
  3. See sodium silicate.
  4. A water gauge made of glass.
  5. See clepsydra.

Sodium silicate; used at one time to preserve eggs, by forming a layer of insoluble calcium silicate around the shell, and so sealing the pores.

water glass or soluble glass, colorless, transparent, glasslike substance available commercially as a powder or as a transparent, viscous solution in water. Chemically it is sodium silicate, potassium silicate, or a mixture of these. It is prepared by fusing sodium or potassium carbonate with sand or by heating sodium or potassium hydroxide with sand under pressure. Water glass is very soluble in water, but the glassy solid dissolves slowly, even in boiling water. Water glass has adhesive properties and is fire resistant. It is used as a detergent; as a cement for glass, pottery, and stoneware; for fireproofing paper, wood, cement, and other substances; for fixing pigments in paintings and cloth printing; and for preserving eggs (it fills the pores in the eggshell, preventing entrance of air).


A silicate of potassium or sodium, soluble in hot water but solid at ordinary temperatures, used for fixed dressings. Also called water glass.


Soluble glass is a popular name for sodium silicate or potassium silicate.

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