cobalt

Everyday

1. Cobalt is a hard, silvery-grey metal; it is a chemical element. tree →
2. Cobalt blue is a deep, bright blue colour made from cobalt and used in paints and glass. tree →

In the lessons

In science, cobalt is one of the metals, and, like iron and nickel, it is magnetic. It is used in strong magnets, batteries and tough tools. In art, cobalt blue is a rich colour of paint and pottery. Phrases: cobalt blue, cobalt glass.

Examples

• Cobalt is a metal that is attracted to magnets. tree →
• The artist painted the sky in cobalt blue. tree →
• The vase was made of deep cobalt glass. tree →
• Some batteries contain cobalt. tree →
• Iron, nickel and cobalt are magnetic metals. tree →
• She wore a cobalt blue dress to the party. tree →

Note

Uncountable: no «a», no plural. Its chemical symbol is Co, with a small «o»; «CO» with capital letters is carbon monoxide, a gas. Pronounced KOH-bolt.