The invisible gas that builds our bodies and protects our planes
In short: Oxygen is nearly invisible, odorless, and tasteless, yet it is the fundamental engine of life. Beyond just helping us breathe, it acts as a chemical architect, creating protective shields for modern technology while simultaneously threatening to dismantle our infrastructure through the slow process of corrosion.
At the cellular level, oxygen is the primary fuel for human survival. Through a process called respiration, your body transports oxygen from the lungs into the bloodstream to reach individual cells. There, it combines with glucose to produce energy, water, and carbon dioxide. This chemical reaction is what allows your cells to function; when you exhale, the air contains roughly 4% less oxygen than when you inhaled, having been traded for carbon dioxide.
On a larger scale, oxygen's reactivity defines the durability of the world around us. It reacts with metals to form metal oxides, a process known as corrosion. However, not all corrosion is destructive. For instance, when oxygen reacts with aluminium, it creates aluminium oxide. This forms a hard, grey protective layer on the surface that prevents further oxidation. Because of this specific chemical property, aluminium became a primary choice of construction material for modern aeroplanes.
Conversely, oxygen can be a destructive force when it interacts with iron in the presence of water. This produces iron(III) oxide, commonly known as rust. Unlike the protective coating on aluminium, rust is flaky and weak, eating into the metal and causing it to degrade. To counter this, humans use barriers like oil on bike chains to prevent oxygen from reaching the iron. In laboratory settings, scientists can even generate oxygen through the chemical decomposition of hydrogen peroxide.
The oxygen we interact with today is the result of millions of years of atmospheric evolution. It currently makes up 21% of the Earth's atmosphere. While it remains a gas at standard temperatures, it reveals a different physical state when extreme conditions are met: when cooled to very low temperatures, oxygen transforms into a pale blue liquid or solid.
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Sources
- Summary by Intellect · source: How Is Oxygen Used | Properties of Matter | Chemistry | FuseSchool
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