Boiling point 90.18 Stable isotopes 3 Heat of vapor. HyperPhysics R Nave Go Back Oxygen Oxygen is the most abundant element in the earth's crust. As a gas, it exists as a diatomic molecule O2.
Ordinary combustion is the process of combining oxygen with other substances.
The energy required for bodily warmth and the physical and chemical process of living organisms is obtained from the combination of oxygen with organic material in food. Reference Pauling Ch. Spin Natural Abund.