What is the composition of air? Here is the percentage of elements!

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.

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