What is the composition of air? Here is the percentage of elements!
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The air in our planet's atmosphere contains not only oxygen. Here is the percentage of each gas in the Earth's dry air:
- Nitrogen (≈78%)
- Oxygen (≈21%)
- Argon, CO2 and other gases (≈1%)
The air we breathe is always blended with water vapours, depending on the relative humidity in each particular area.