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Because of the critical role played by steel in infrastructural and overall economic development, the steel industry is often considered to be an indicator of economic progress. Steel is traded as a commodity.
The two most commonly used structural metals, iron and aluminium, are also the most abundant metals in the Earth's crust. Metals are good conductors, making them valuable in electrical appliances and for carrying an electric current over a distance with little energy lost.
The thermal conductivity of metal is useful for containers to heat materials over a flame. The high reflectivity of some metals is important in the construction of mirrors, including precision astronomical instruments.
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