Ozone Units of Measure, what do they all mean?

Posted by Joel Leusink on December 9, 2011 under Ozone News | 2 Comments to Read

ppm, ppb, g/m3, mg/l, and many others.  What do these all mean?  And what do they have to do with ozone?  Why do scientific papers have to be so confusing?  Let me try to help, keep reading.ppm, mg/l, lb/day, units of measure

ppm, mg/l, lb/day, units of measure

ppm = Parts per Million – Is a concentration measurement.  This would indicate how many parts of the gas in question (ozone in our case) there are in every 1 million parts of total gas.  For example, if we state there is 1 ppm ozone, that means for every 1 million parts of gas, 1 of these is ozone.  The tricky thing with ppm is that we can be measuring the “parts”  by volume, or weight.  Sometimes you may see this as ppmv, indicating parts per million by volume.   This is the most common ozone measurement.  ppm is used to measure ozone in air and ozone dissolved into water.

ppb = Parts per Billion – This is to indicate the same thing as ppm, only change the million to a billion.  This moves a decimal p


oint 3 places.  for example 0.1 ppm = 100 ppb.

ozone formulas

mg/l – Milligrams of ozone per Liter – Is a concentration measurement.  This indicates how many milligrams of ozone there are in one liter of total volume.  mg/l can be used to indicate the concentration of ozone in gas or liquid.

1 mg/l of ozone = 1 ppm of ozone in water.  Due to the density of air this is no longer true and 1 ppm of ozone = 2140 mg/l.  This is a common term used to measure the amount of ozone dissolved into water.

ug/ml – Microgram per millileter - Is a concentration measurement.  This indicates how manymicrograms of ozone there are i

n one milliliter of total volume.  mg/l can be used to indicate the concentration of ozone in gas or liquid.

1 ug/ml = 1 mg/l – these terms are equal, no conversion is necessary

ozone conversions


g/m3  = Grams of ozone per Cubic Meter – Is a concentration measurement.  This indicates how many grams of ozone there are in one cubic meter of total volume.  This can indicate volume of a gas or liquid.  g/m3 is most commonly used to measure the concentration of ozone in a gas stream.

1 g/m3 = 1 mg/l = 1 ppm of ozone in water

1 g/m3 = 467 ppm of ozone in air

% by weight (Percent by weight) – is a concentration measurement.  This indicates the percentage (%) of ozone within a given gas stream.  This is a very common method to illustrate the concentration of ozone from an ozone generator.  This is more complicated than g/m3 as the weight of gas changes if it is air, or oxygen gas that the ozone gas is mixed with.

1% Ozone = 12.8 g/m3 Ozone in air

1% Ozone = 14.3 g/m3 Ozone in oxygen

g/hr (gm/hr) – grams of ozone per hour – Is a measurement of ozone production.  This is the most common method of measuring the output of an ozone generator.  We can measure the concentration of ozone in g/m3, then when we calculate for flow rate with a measurement like LPM (liters per minute) we can determine how many grams of ozone are produced in one hour of time.

mg/hr – milligrams of ozone per hour – This indicates the same thing as g/hr only on a smaller scale.  Smaller ozone generators may be rated in mg/hr.

1 g/hr of ozone = 1,000 mg/hr of ozone production.

lb/day – Pounds per Day – Is a measurement of ozone production.  This is a common measurement of ozone production of much larger ozone generators.  This is a common term to use for large ozone generators, and is commonly used in some industries within the ozone world.

1 lb/day of ozone = 18.89 g/hr ozone production.

ozone conversions

Ozone production can also be displayed in kg/hr, kg/day, or many other measurement, these can all be simply converted for easier understanding for all parties.

There may be other units of measure used, however these are the most common.  Other units of measure can be converted to more common units of measure as needed.

If the work of calculating the output of an ozone generator, or the dosage rate of ozone into water is too much for you, please, use our online calculator to help you out.

 

Should you have questions that are not answered here please contact our application engineers for help.

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