FUSE Winter 2017-2018 - Page 6

FUSE Young Reporter iSCIENCE Gold has become a valuable treasure. From the ancient Egyptians to the present times it has played a great role in history. Many nations still count their wealth according to the amount of gold they keep in storage. Large amounts of gold are still used in the manufacturing of coins, medals, jewellery and art. It is a good choice because due to its chemical properties gold does not rust or tarnish very easily, nor is it very reactive with oxygen, acids or halogens such as chlorine. Gold also has a number of uses in industry, medicine and other applications. For example, one radioactive isotope of gold is commonly used to treat cancer. Gold is quite soft and can usually be scratched by a penny. Its melting point is a massive 1,064.76 °C and its boiling point is about 2,700 °C. Its density is 19.3 g/cm 3 . Gold is both ductile (flexible) and malleable (mouldable). So, a small 20g piece of gold can become thin, flexible wire...or a huge, hammered sheet of gold foil covering over 6 m 2 , but only 0.00025 cm thick! WEB TIP Celsius (ºC), Fahrenh eit and Kelvin scales: FUSE Winte r 2016-17 ANCIENT WORLD BC / BCE AD / CE 6 FUSE of years The number t’ is believed ‘Before Chris born / to have been mon Era’. ‘Before Com i; Medieval Anno Domin e year of the Latin for ‘in th om Jesus’ ng fr Lord’, counti on Era’. birth / ‘Comm