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Ozone Properties

Ozone Properties

Property Ozone Oxygen
Molecular Formula O3 O2
Molecular Weight 48 g/mol 32 g/mol
Smell
  • Clothes after being outside on clothesline
  • Photocopy machines
  • Smell after lightning storms
 Odorless
Color Light blue Colorless
Boilint Point -111.3 °C (-168.4 °F) -183 °C (-297.4 °F)
Density 2.141 kg/m3 (0.133 lb/ft3) 1.429 kg/m3
Electrochemical Potential 2.07 1.23
Specific gravity @ STP (air = 1) 1.612 1.105
Solubility in Water (0°C) 190 mg/l 14.6 mg/l
CAS number 10028-15-6 7782-44-7
Odor Threshold 5-20 PPB (0.005 - 0.02 PPM) Odorless

Ozone Half-Life vs. Temperature

Temp (°C) Half-life in air*
-50 3 months
-35 18 days
-25 8 days
20 3 days
120 1.5 hours
250 1.5 seconds
Temp (°C) Half-life in water (minutes)
15 30
20 20
25 15
30 12
35 8

( * These values are based on thermal decomposition only. No wall effects, humidity, organic loading or other catalytic effects are considered.)