Glass is made by combining sands,which is contain silica(SiO2), soda ash and limestone. These raw materials are mixed and put in a furnace to be melted at a very high temperature. After the materials becomes a molten glass, it can easily formed into any shapes.
There are two basic shapes of glass. The first shape is plate glass which is made by flattened out the molten glass using some rollers. The second shape is bottle glass. It is made in several steps which is more complicated than steps in making plate glass. The first step is placed the molten glass at the end of a blow pipe. Second, it blown by the air from the pipe which will makes it expanded while dropping into a removeable mould. Last, the expanded molten glass keeps blown by the air until it is follow the shape of the removeable mould.
After the shaping process, a well formed glasses are being cooled down in several days and then they are ready to use.
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