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Atmosphere >> Venus’ atmosphere

Chemical composition of the atmosphere of Venus

In the cloud layer, sulphur dioxide (SO2) and water (H2O) in both solid and gaseous state are present, as well as sulphuric acid (H2SO4) in liquid state. Carbon dioxide still dominates.

Percentage in the lower atmosphere
(below the clouds)

96.5 %

Less than 3.5 %

0.015 %

0.007 %

0.002 %

0.0017 %

0.0012 %

0.001 %

0.0007 %

The higher atmosphere consists primarily of carbon dioxide (more than 96 %). There are also traces of molecular nitrogen (N2) and carbon monoxide (CO).

We can wonder why there is so much more CO2 in Venus’ atmosphere compared to that of the Earth. Carbon dioxide was certainly more abundant in the past than it is now. With time, it has dissolved in the seas and migrated into rocks, so that nowadays there is less in the atmosphere.

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