Ozone is a triatomic form of oxygen, meaning that the molecule, ozone, is made up of 3 oxygen atoms. Unlike oxygen, ozone is a visible gas with a light blue color at very high concentrations. At low concentrations ozone is colorless. Ozone also has a distinct odor that is noticeable at very low levels and may be associated with a “cleansmell, at higher levels ozone has a very pungent odor. Ozone is an unstable gas that readily decomposes to oxygen naturally. Ozone is also a highly reactive gas that acts as a very strong chemical oxidant.

Physical Properties, Standard conditions

P = 1.01325 Pa, T = 273.3 K

Density of ozone   2.14 kg/m3
Molecular weight of ozone    48
Density of oxygen  1.43 kg/m3
Molecular weight of oxygen   32
Density of air  1.29 kg/m3



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