The glass is an amorphous, transparent and supercooled liquid which is prepared from the homogenous mixture of silicates of different metals.
|3.||Copper oxide/Selenium oxide||Red|
|7||Tin oxide||Milky White|
Raw materials used in the preparation of ordinary glass are- 50% silica, 15% sodium carbonate, 10% calcium carbonate and 25% piece of glass.
The industrial chemical formed by silica, lead oxide and potassium carbonate is lead crystal glass.
When the mixture of silica and sodium carbonate is heated, water glass is formed. Water glass is soluble in water and it is used to make fire proof materials.
The common name for borosilicate glass is Pyrex glass. Borosilicate glass is used to make laboratory equipments because a. It is resistant to chemicals. b. It can withstand high temperature.
The following are the properties by which glass is more useful:
i. Glass is attractive and transparent.
ii. It is insoluble in water.
iii. It is not affected by chemicals.
iv. It can be made colorful by mixing different colors.
v. It disperses and refracts the light.
The glass which is made by heating of the mixture of potassium carbonate, calcium carbonate, and silica is called hard glass. It is used for making different types of laboratory equipment like beaker, hard glass-test-tubes, etc. and electric bulbs and tube lights. The glass which is prepared by heating the mixture of sodium carbonate, calcium carbonate and silica is called soft glass. It is used for making bottles, windows pans, ordinary glass tubes, glass sheets, etc.
The glass that is obtained by heating pure silica at 16000C is called ______.