O2molekyyli

O2molekyyli, commonly known as oxygen, is a diatomic molecule with the chemical formula O2. It is a gas at standard temperature and pressure and is essential for aerobic respiration in most living organisms. Oxygen molecules consist of two oxygen atoms joined by a double covalent bond. This strong bond requires a significant amount of energy to break.

In its molecular form, O2 is colorless, odorless, and tasteless. It is paramagnetic, meaning it is weakly attracted to a magnetic field. Oxygen is highly reactive and readily forms compounds with most other elements, a process known as oxidation. This reactivity is fundamental to many natural processes, including combustion and the rusting of metals.

The Earth's atmosphere contains approximately 21% oxygen by volume. This oxygen is primarily produced through photosynthesis by plants, algae, and cyanobacteria, which convert carbon dioxide and water into glucose and oxygen using sunlight as energy. Oxygen plays a critical role in the planet's climate and the geological cycling of elements. Its presence is indispensable for the survival of complex life as we know it.