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Aluminium was so expensive in the past because it was extremely difficult to prepare it in a metallic form. First metallic aluminium was prepared by Oersted (1825) and subsequently by Wohler (1827). Deville found a way to make a metallic aluminium cheaper in 1854. Anyway, even shortly before Hall-Heroult process in 1890 one kilogram was worth of 33 $. (Huge money at that time.) After Pittsburgh Reduction Company started commercial production the price dropped to 1$ per kilogram - less than today's price !
Production of one kilogram of metallic aluminium needs 4 kilograms of bauxite and consumes approx. 15 kilowatts-hours of energy.
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In 1820 is the 18th century?
No, the 18th century lasted from 1701 - 1800. The year of 1820 was during the 19th century.
Is 1655 the 18th century?
No, the year of 1655 was during the 17th century. The 18th century lasted from 1701-1800.
What century was 1789?
Nearing the end of the 18th century.
What century was 1793 in?
The 1700s are referred to as the 18th century.
What years made up the 18th century?
The 18th century is a period of time starting in 1701 and ending in 1800.
