What are the main components of air?

🇫🇷 French Version

I— Is air a mixture? 💨

Dry air is therefore a mixture.
It is not a pure substance.

II— The main components of dry air 📊

Composition of dry air:

Name: Nitrogen
Formula or symbol: N2
Volume proportion: 78.08 %
Name: Oxygen
Formula or symbol: O2
Volume proportion: 20.95 %
Name: Argon
Formula or symbol: Ar
Volume proportion: 0.934 %
Name: Carbon dioxide
Formula or symbol: CO2
Volume proportion: 0.0382 %
Name: Neon
Formula or symbol: Ne
Volume proportion: 0.0018 %

Dry air contains mainly nitrogen N2 and Oxygen O2.

It contains about 80 % nitrogen N2 and 20 % Oxygen O2 (4 times more nitrogen N2 than Oxygen O2 ).

III— Carbon dioxide 🌡️

Dry air contains less than 0.04 % carbon dioxide CO2.
This amount seems negligible.

However, scientists monitor its evolution because carbon dioxide is one of the gases responsible for global warming.

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