Foil (metal)
A foil is a very thin sheet of metal, typically made by hammering or rolling.<ref>Britannica, The Editors of Encyclopædia. "foil". Encyclopædia Britannica, 6 Nov. 2008, https://www.britannica.com/technology/foil-metallurgy. Accessed 11 September 2022.</ref><ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Foils are most easily made with malleable metal, such as aluminium, copper,<ref>Template:Cite news</ref> tin, and gold. Foils usually bend under their own weight and can be torn easily.<ref name=":0" /> For example, aluminium foil is usually about Template:Convert, whereas gold (more malleable than aluminium) can be made into foil only a few atoms thick, called gold leaf. Extremely thin foil is called metal leaf. Leaf tears very easily and must be picked up with special brushes.Template:Citation needed
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References
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