Pure gold is soft and is usually alloyed with other metals, such as silver, copper, platinum or palladium, to increase its strength. Gold alloys are used to make jewelry, decorative items, dental fillings and coins. The amount of gold in an alloy is measured with a unit called a karat. Also, because gold is soft and does not tarnish or corrode, it makes excellent jewellery, it is a good material for filling cavities in teeth, and it makes excellent fine wire for electronics. Gold is very reflective, so it is used to protect spacecraft and satellites from solar radiation.
- Used as a precious metal throughout the history of mankind
- Resistance to corrosion
- Distinctive properties as a metal
- Gold has been used for coinage throughout the centuries
- Automobile industry
- General engineering industry
- Jewelry industry