THE GOLD CHARACTERISTICS

Chemical symbol       :   Au     (from the Latino Aureum)

Specific gravity:        :    19,3  (plumb 11,4, iron 7,9, lodestone 5,1 - quartz 2,7)

Hardness                   :    2,5

Colour                       :   yellow reddish with metal brilliance

Temperature of fusion    :   1063°C   boils to  2700°C                                  

Leading optimum of heat and marked.

Affinity electricity presents the gold toward the mercury: the amalgam is formed with extreme easiness.

Putting the mercury to contact with the gold it becomes white and fragile.

It's, between all the metals, the most malleable (property to let him reduce in thin sheets)

and the most ductile (property to let him reduce in very thin threads).

It can be laminated in very thin sheets with thickness up to 0.01mm., a green light filters through

and it can be pulled in so thin threads that, with an only gram, it is possible to exceed the 3 km.

It is however tender, so for the practical jobs turning to leagues is necessary, for Es. with the copper, silver, palladio, zinc, stagnate, etc..

The proportion made of gold in these leagues expresses himself in carats

(amount made of thin gold contained in a league of this metal, expressed in twenty-fourth of the total mass).

The title of the gold is expressed also in thousandth and a carat pays thousandth to a title of 41,666.

The worked gold is normally to 18 carats and contains 18 childbirths of gold and 6 of other metals, you seem to the legal title of 750/1000.

Tradingly, on the worldwide market, the gold price is expressed in US$ for thin gold ounce (1 ounce= gr. 31,1328).

The gold is not just used in the jeweller's shop.

For his inertia, exceptional resistance to the oxidation and the corrosion, the very low electric resistance is widely used in the industries electric,

electronic and the building of the space vehicles.