Traditional Culture Encyclopedia - Weather forecast - Where can I check the daily air humidity?
Where can I check the daily air humidity?
Air, the "breath of life" we breathe every day, covers the surface of the earth layer by layer, is transparent, colorless and tasteless, and is mainly composed of nitrogen and oxygen, which has an important impact on human survival and production.
Air refers to the mixed gas in the earth's atmosphere, so air is a mixture, mainly composed of nitrogen, oxygen, rare gases (helium, neon, argon, krypton, xenon, radon), carbon dioxide and other substances (such as water vapor and impurities).
Among them, the volume fraction of nitrogen is about 78%, the volume fraction of oxygen is about 2 1%, the volume fraction of rare gases (helium, neon, argon, krypton, xenon and radon) is about 0.934%, the volume fraction of carbon dioxide is about 0.04% (data 20 17), and other substances (such as )
Oxygen in the air is necessary for all aerobic organisms. All animals need to breathe oxygen, so do green plants. In addition, green plants use carbon dioxide in the air for photosynthesis, and air is almost the only source of carbon dioxide needed by all plants.
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