Three metals (Al, Mg, Be) from four light structural metals belong to the 10 lightest metals, together with alkali metals (Na, K, Cs, Rb) and the alkaline earth Calcium | Credit: Science Notes (Mar 26, 2020)

Light metals are metallic elements or alloys characterised by a relatively low density — conventionally defined as a density below 5.0 g/cm³ — combined with a high strength-to-weight ratio. This combination of low weight and structural performance makes them indispensable across aerospace, automotive, construction, electronics, and biomedical industries, wherever weight reduction without loss of mechanical integrity is a primary design requirement.

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