# UNITS OF MEASURE

 Abbreviations For these formulas GPM Gallons per Minute PPM Parts per Million g/hr. Grams per Hour SLPM Standard Liters Per Minute % O3 Percentage Ozone concentration g/m3 Grams per Cubic Meter CFM Cubic Feet per Minute PPHM Parts per Hundred Million

PHYSICAL PROPERTIES, STANDARD CONDITIONS: P = 101325 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 Density of Water: 1000 kg/m3

# USEFUL CONVERSION FACTORS (for water)

 1000 liters  = 1 m3 = 264 US gallons 1 gal     = 3.785 liters = 3785 ml 1 m3     = 35.3 ft3 = 264 US gallons

# OZONE CONCENTRATION IN WATER

 1 mg/l = 1 ppm O3 = 1 g O3/m3 water (by weight)

# OZONE CONCENTRATION IN AIR BY VOLUME

 1 g O3/m3 = 467 ppm O3 1 ppm O3 = 2.14 mg O3/m3 100 pphm = 1 ppm

# OZONE CONCENTRATION IN AIR BY WEIGHT

 100 g O3/m3 = 7.8% O3 (approximate) 1% O3 = 12.8 g O3/m3 (approximate) 1% O3 = 7284 ppm ozone

# OZONE CONCENTRATION IN OXYGEN BY WEIGHT

 100 g O3/m3 = 6.99% O3 (approximate) 1% O3 = 14.3 g O3/m3 (approximate) 1% O3 = 6520 ppm ozone