ECONOMICS (CBSE/UGC NET)

Detailed explanation-1: -Both lime and limestone (calcium carbonate) are essential components in glassmaking, as calcium is used as a stabiliser that improves the quality and physical appearance of the glass. Quicklime (calcium oxide) can also be used where higher efficiencies and outputs are required during glass manufacturing.

Detailed explanation-2: -Limestone is an essential ingredient in glassmaking.

Detailed explanation-3: -Limestone is a source of lime (calcium oxide), which is used in steel manufacturing, mining, paper production, water treatment and purification, and plastic production. Lime also has major applications in the manufacture of glass and in agriculture.

Detailed explanation-4: -Also known as lime, calcium carbonate is found naturally as limestone, marble, or chalk. The soda makes the glass water-soluble, soft and not very durable. Therefore lime is added increasing the hardness and chemical durability and providing insolubility of the materials.

Detailed explanation-5: -Basalts are the main raw materials for the iron-rich glass and glass-ceramic materials. They are characterized by low viscosity, which allows production of polycrystalline materials by applying short production cycles at low temperature.