Oxygen

bivalent oxygen, tasteless, odourless and colourless Gas; vital for the majority of higher organisms.

Oxygenium (from Greek oxys "sharp, pointed, acidic" and "produce" gene) at room temperature gaseous chemical element, necessary for the energy production of most organisms. After inhalation, transport to the tissues on the bloodstream takes place predominantly by binding to the haemoglobin of the erythrocytes.

Oxygen is a colorless and odorless gas, which is contained in the air to 20.942 %. It is the most common element on earth and necessary for all combustion and corrosion processes. All animals and most plants need oxygen to live. They usually remove it from the air by respiration or from the water by absorption.

In hohen Konzentrationen dagegen ist Sauerstoff für die meisten Lebewesen giftig. Das ist zum Beispiel im Rettungsdienst zu beachten, wenn Sauerstoff über Sonden oder Masken dem Verunfallten zugeführt wird.

https://de.wikipedia.org/wiki/Sauerstoff _{(Wikipedia CC-by-sa-3.0)}