what is air
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Air is a mixture of gases that makes up the Earth’s atmosphere. It is composed of approximately 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and trace amounts of other gases such as neon, helium, methane, and krypton. Air also contains water vapor, which varies depending on location and weather conditions.
Air plays an essential role in supporting life on Earth by providing oxygen for respiration, regulating the temperature and climate, and protecting the planet from harmful radiation. It also plays an important role in various human activities, such as transportation, communication, and energy production.