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Physical & Chemical properties

Appearance / physical state / colour

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Reference
Endpoint:
appearance / physical state / colour
Type of information:
other: Handbook data.
Adequacy of study:
key study
Study period:
1982
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
no guideline followed
Version / remarks:
Handbook data.
Principles of method if other than guideline:
Principle of method not specified; handbook data.
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
gaseous
Form:
gas
Colour:
colourless to pale blue
Odour:
pungent
Substance type:
natural substance
Conclusions:
Ozone is a colourless to pale blue gas with pungent odour at 20 °C.
Executive summary:

Ozone is a natural substance present in the earth's atmosphere (formed photochemically). At 20°C, ozone is a blue gas, but at the concentrations at which it is ordinarily produced, this colour is not noticeable unless the gas is viewed through a considerable depth. Ozone gas has a pungent, characteristic odour.

Description of key information

Ozone is a colourless to pale blue gas with pungent odour at 20 °C.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
gaseous

Additional information