What is Float glass?
[[File:CrystalPalaceStation.jpg|right|thumb|Use of float glass at Crystal Palace railway station, [[London]]]] '''Float glass''' is a [[wiktionary:sheet#Noun|sheet]] of [[glass]] made by melting glass and spreading it on [[wiktionary:molten#English|molten]] metal that has a low [[melting point]], such as [[tin]],<ref>{{Cite book|url=https://books.google.com/books?id=Qk4aEAAAQBAJ|title=Encyclopedia of Glass Science, Technology, History, and Culture|last=Richet|first=Pascal|date=2021-02-05|publisher=John Wiley & Sons|isbn=978-1-118-79939-0|location=|pages=73–74}}</ref> or [[lead]].<ref>{{Cite book|url=http://worldcat.org/oclc/819741821|title=Materials for interior environments|last=Binggeli|first=Corky|date=7 October 2013|publisher=[[Wiley (publisher)|Wiley]]|isbn=978-1-118-30635-2|location=|page=86|oclc=819741821|id=819741821}}</ref> In this way, we get a very flat and [[wiktionary:evenly#English|evenly]] thick surface.<ref>{{Cite book|url=https://books.google.com/books?id=FuK1EAAAQBAJ|title=Fundamentals of Modern Manufacturing: Materials, Processes, and Systems|last=Groover|first=Mikell P.|date=2021|publisher=John Wiley & Sons|isbn=978-1-119-70642-7|location=|page=207}}</ref> Making float glass like that, is also known as the '''Pilkington [[wiktionary:process#English|process]].'''<ref>{{Cite book|url=https://books.google.com/books?id=_XhhDwAAQBAJ|title=Fifty Materials That Make the World|last=Baker|first=Ian|date=2018-06-21|publisher=[[Springer Publishing Company|Springer]]|isbn=978-3-319-78766-4|location=|page=66}}</ref> It was given this name, because the glass-making [[wiktionary:company#Noun|company]] Pilkington was the first to use this way of making glass in the [[1950s]], at their [[factory]] in [[St Helens, Merseyside]], England.<ref>{{Cite web|title=The Story of Pilkington UK|url=https://www.pilkington.com/en-gb/uk/about/heritage/the-story-of-pilkington-uk|access-date=2023-04-09|website=www.pilkington.com}}</ref> Modern [[Window|windows]] are usually made from float glass.<ref>{{Cite book|url=https://