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Light metal A light metal is any metal of relatively low density.〔Jackson JA, Mehl JP, Neuendorf KKE (eds) 2005, ''Glossary of Geology,'' 5th ed., American Geological Institute, Alexandria, ISBN 0-922152-76-4, p. 371〕 More specific definitions have been proposed; none have obtained widespread acceptance. Magnesium, aluminium and titanium are light metals of significant commercial importance.〔Brandes EA & Brook GB (eds) 1998, ''Light Metals Handbook,'' Butterworth Heinemann, Oxford, ISBN 0-7506-3625-4, p. viii〕 Their densities of 1.7, 2.7 and 4.5 g/cm3 range from 19 to 56% of the densities of the older structural metals,〔Polmear I 2006, ''Light Alloys: From Traditional Alloys to Nanocrystals,'' 4th ed., Butterworth Heinemann, Oxford, ISBN 0-7506-6371-5, p. 1〕 iron (7.9) and copper (8.9). ==See also==
* Heavy metal (chemical element)
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