Context: Following the glass batch preparation and mixing, the raw materials are transported to the furnace. Soda-lime glass for mass production is melted in gas fired units. Smaller scale furnaces for specialty glasses include electric melters, pot furnaces, and day tanks. After melting, homogenization and refining (removal of bubbles), the glass is formed. Flat glass for windows and similar applications is formed by the float glass process, developed between 1953 and 1957 by Sir Alastair Pilkington and Kenneth Bickerstaff of the UK's Pilkington Brothers, who created a continuous ribbon of glass using a molten tin bath on which the molten glass flows unhindered under the influence of gravity. The top surface of the glass is subjected to nitrogen under pressure to obtain a polished finish. Container glass for common bottles and jars is formed by blowing and pressing methods. This glass is often slightly modified chemically (with more alumina and calcium oxide) for greater water resistance. Further glass forming techniques are summarized in the table Glass forming techniques.

Question: What happens during refining?
Answer: removal of bubbles

Question: What method is used for making windows?
Answer: float glass process

Question: What is used on the surface of window glass to make it smooth?
Answer: nitrogen

Question: What is added to the glass of jars to improve water resistance?
Answer: alumina and calcium oxide

Question: Who were the inventors of the float glass process?
Answer: Alastair Pilkington and Kenneth Bickerstaff

Question: What happens during forming techniques?
Answer: Unanswerable

Question: What method is used for making raw materials?
Answer: Unanswerable

Question: What is used on the surface of jar glasses to make them smooth?
Answer: Unanswerable

Question: What is added to the glass of windows to improve water resistance?
Answer: Unanswerable

Question: Who were the inventors of molten glass flows?
Answer: Unanswerable