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 high concentrations, however, oxygen is toxic to most living organisms. This must be taken into account, for example, in the rescue service when oxygen via probes or masks is supplied to the casualty.