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== Explanation == | == Explanation == | ||
Oxygen is the most essential [[gas]] that makes [[life]] possible on [[Earth]]. Physically, the gas is colourless, odourless and tasteless. At standard [[temperature]] and [[pressure]], Oxygen is usually found as dioxygen '''O<sub>2</sub>'''. Most oxygen on the surface of the Earth are found as O<sub>2</sub>, making up about 20.8% of the atmosphere. Most of the oxygen comes from the plants by the process of [[photosynthesis]]. In the [[stratosphere]] region, the second form of oxygen can be found as a layer of [[ozone]] '''O<sub>3</sub>''' about 10 ppm, absorbing 99% of the [[Sun]]'s [[ultraviolet]] radiation. O<sub>2</sub> can be condensed to a blue liquid form as liquid oxygen. Oxygen, due to its [[electronegativity]], is highly reactive and it readily [[oxidation|oxidizes]] organic materials. Trioxygen (ozone) can also be condensed to a highly unstable liquid form of liquid ozone as well. | Oxygen is the most essential [[gas]] that makes [[life]] possible on [[Earth]]. Physically, the gas is colourless, odourless and tasteless. At standard [[temperature]] and [[pressure]], Oxygen is usually found as dioxygen '''O<sub>2</sub>'''. Most oxygen on the surface of the Earth are found as O<sub>2</sub>, making up about 20.8% of the atmosphere. Most of the oxygen comes from the plants by the process of [[photosynthesis]]. In the [[stratosphere]] region, the second form of oxygen can be found as a layer of [[ozone]] '''O<sub>3</sub>''' about 10 ppm, absorbing 99% of the [[Sun]]'s [[ultraviolet]] radiation. O<sub>2</sub> can be condensed to a blue liquid form as liquid oxygen. Oxygen, due to its [[electronegativity]], is highly reactive and it readily [[oxidation|oxidizes]] organic materials. Trioxygen (ozone) can also be condensed to a highly unstable liquid form of liquid ozone as well. | ||