Oxygen is a chemical element that is essential for the survival of most living organisms. It is a colorless, odorless gas that makes up about 21% of the Earth's atmosphere. The symbol for oxygen is O, and it has an atomic number of 8. Oxygen is crucial for respiration, as it is used by cells to convert glucose into energy. It plays a vital role in the process of oxidative metabolism, which allows living organisms to extract energy from food. In its molecular form, oxygen exists as a diatomic gas, commonly known as oxygen gas or molecular oxygen. This is often referred to as "air" and is made up of two oxygen atoms bonded together. Oxygen gas is highly reactive and supports combustion, making it essential for fire and burning processes. Additionally, oxygen is often used in medical settings to provide supplemental oxygen to patients who have difficulty breathing.
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