While researching the melting temperature of glass (1400 - 1600 C), I discovered how glass panes ("float glass" [1]) are made: molten glass is floated on molten

While researching the melting temperature of glass (1400 - 1600 C), I discovered how glass panes ("float glass" [1]) are made: molten glass is floated on molten tin in a positive-pressure of nitrogen (to keep the tin from oxidizing). The molten tin provides a very flat surface for the glass to cool on, which means cheaper glass because you don't have to polish the sides after it cools. I had no idea! [1] https://en.wikipedia.org/wiki/Float_glass https://en.wikipedia.org/wiki/Float_glass