The color of liquid oxygen is a blue similar to sky blue. The phenomena are not related; the color of sky is due to Rayleigh scattering and would be present even if there were no oxygen in air.Dioxygen, O2, is a gas at standard conditions, consisting of 2-atom molecules. Elemental oxygen is most commonly encountered in this form, as 21% of Earth's atmosphere. Note that the double bond depicted here is an oversimplification; see triplet oxygen.Ozone, O3, is a gas at standard conditions, consisting of 3-atom molecules. This oxygen allotrope is rare on Earth and is found mostly in the stratosphere.Annual mean sea surface dissolved oxygen for the World Ocean. Note more oxygen in cold water near the poles.
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