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Question

Glass production:

Vidyadip · Accepted Answer

The general preparation of the glass is as follows:

Mixture of sand, soda, lime and small quantity of magnesium oxide is heated in furnace.
At 1700 °C sand or silicon dioxide melts.
To make the mixture melt at lesser temperature, pieces of discarded glasses are added to it.
This addition makes the mixture to melt at lesser temperature of 850 °C.
When all the ingredients of mixture are liquified, then again it is heated up to 1500 °C.
This heating is immediately followed by cooling.
The sudden cooling causes the mixture to become homogeneous, amorphous and transparent instead of crystalline.
For variety of glass types, different proportions of ingredients are used for heating.

Answer