Aurum

The Latin aurum for Gold means “shining dawn”.

Chemical element

Gold has chemical symbol Au, melting point 1,064 °C and boiling point 2,600 to 2,864 °C.

Origin of gold

Gold does not come from Earth; it was formed at explosion of stars and transported to Earth by meteorites some 200 million years after the Earth’s formation.

Earth’s crust

Gold content in a ton of Earth’s crust rocks averages at 0.0045 g.

Purity rate

Purity rate (“pure” = clean, unalloyed) is a numerical representation of relative mass content of gold in an object or alloy.

Karats

Purity rate is traditionally noted in karats (kt) one karat being 1/24 of the total mass so a pure gold has 24 karats.

Omnipresence

Gold is present essentially everywhere; it migrates from rocks to water, plants as well as animate beings.

Human body

Our body contains about 0.2 milligrams of gold, mostly in blood.

Gastronomy

Gold is edible and does no harm to us therefore it is used also in high gastronomy.

Softness

Pure gold is soft and can be scratched by nail.

Conductivity

Gold is the second most conductive metal behind silver.

Mendeleev system of chemical elements

Gold is at 79th position in Mendeleev system of chemical elements.

Density

Gold has high density; 19 times higher than water and 2.5 times higher than iron.

A ton of gold

One ton of gold can be accommodated by a cube with 37.27 cm long edge.

An ounce of gold

One ounce (31.1 g) of gold can be hammered out to a 9 x 9 m plate or 76 km long wire.

Gold plating

Objects are gold plated using gold flakes of 0.0001 mm thickness.

Eiffel tower

All physical gold in the world could be contained on the first floor of Eiffel tower.

The biggest gold brick

The biggest gold brick in the world weighs 250 kg.

Stock of extracted gold

The year-by-year increase of world’s stock of extracted gold is only 1 to 2 %.

Nugget

Nugget is a natural piece of gold of various size and shape.

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