Tennant also proved that when equal weights of charcoal and diamonds were burned, they produced the same amount of carbon dioxide.
In 1796, English chemist Smithson Tennant established that diamond was pure carbon and not a compound of carbon; it burned to form only carbon dioxide.
Your brain interprets this rapid transfer of heat energy away from your skin as meaning you are touching something very cold – so diamonds at room temperature can feel like ice.
Carbon (in the form of coal, which is mainly carbon) is used as a fuel.
Graphite is used for pencil tips, high temperature crucibles, dry cells, electrodes and as a lubricant.
Diamonds are used in jewelry and – because they are so hard – in industry for cutting, drilling, grinding, and polishing.