Platinum is a member of the platinum group metals and is lustrous, malleable and ductile. Of the group of six metals (Pt, Pd, Os, Ir, Rh and Ru), it is the most important. It is unaffected by oxygen and water and is only soluble in aqua regia or fused alkalis. Applications for platinum are many and varied; for example, it is used to make weights and measures standards, it is used in the electronics industry for electrical contacts which might be subject to high temperatures, and it is used to manufacture electrodes which might be subject to chemical attack. A current and important use of platinum is in car exhaust catalysts, in which a ceramic honeycomb is coated with platinum. Platinum is also used to manufacture jewellery and, along with gold and silver, has its own hallmark.
- Known to native South Americans before the arrival of Columbus and was introduced into Europe around 1750. The first mention of the metal platinum in any written text was in 1557.
- 0.001 ppm in the earth’s crust.
|Atomic / Molecular Weight||195.08||gmol-1||Clip|
|Specific heat capacity||134||Jkg-1K-1||Clip|
|Latent heat of fusion||113000||Jkg-1||Clip|
|Thermal conductivity||69 to 72||Wm-1K-1||Clip|
|Acoustic wave velocity (longitudinal bulk waves)||3260||ms-1||Clip|
|Acoustic wave velocity (Irrotational waves)||2800||ms-1||Clip|
|Acoustic wave velocity (Shear waves)||1730||ms-1||Clip|
|Bulk Modulus of Rigidity||228000000000||Nm-2||Clip|