In chemistry, oxygen is an element with an atomic weight of 15.96. It is capable of combining with all elements, with the exception of fluorine, to form oxides, bases, oxyacid anhydrides, etc. At room temperature, oxygen is only moderately active with most substances. However, at higher temperatures, it becomes very active that it is considered as one of the most powerful chemical agents.
In biology, the oxygen plays a crucial role in various biochemical and physiological processes, such as in cellular respiration. Its presence makes cellular respiration about ten times more efficient in yielding ATP.