Oxygen

O2

Characteristics

Oxygen is a colorless and tasteless gas


It forms 21% of the atmosphere by volume and 23% by weight


It makes up one half of earth's crust and one fifth of the air we breath


It doesn't burn


It can also be a liquid and a solid

Uses

Oxygen is used to make different acids


Hot oxygen air is required to make iron and steel

It is also used to cut and melt metals


It is used in airplanes and cars


Some mining companies use it to destroy rocks

History

Oxygen was discovered in 1774


Before oxygen air was felt to be an element in its own right


It was prepared by workers before 1772 but they didn't recognize it as an element