##### Summary:- Ratios of parts per million or ppm in Standard, Imperial and Metric units
 ppm = parts per million

 After determining the correct volume of water to be treated, use this formula to calculate the correct amount of material to use:- Amount of material needed = Vol. x Conv. factor x ppm desired x (100 / % active ingredient) Vol. = volume of water to be treated. Can be any volumetric units of measurement - cubic feet, litres, gallons, acre-feet. Conv. factor = the weight of material that must be added to one unit volume of water to give one part per million (ppm). See below for conversion factors. ppm desired = the treatment rate desired in parts per million (ppm) % active ingredient = the percent ingredient of the material to be used. Most materials used in treating fish diseases or aquatic weeds are 100% active or are considered to be 100% active for treatment purposes.

#### Weight of chemical that must be added to one unit volume of water to give one part per million (ppm)

 2.72 pounds per acre-foot = 1 ppm 1,233 grams per acre-foot = 1 ppm 1.233 kilograms per acre-foot = 1 ppm 0.0283 grams per cubic foot = 1 ppm 0.0000624 pounds per cubic foot = 1 ppm 0.0038 grams per US gallon = 1 ppm 0.058419 grains per US gallon = 1 ppm 0.07016 grains per Imperial gallon = 1 ppm 1 milligram per litre = 1 ppm 1 microlitre ( µL ) per litre = 1 ppm 0.001 gram per litre = 1 ppm 8.345 pounds per million gallons of water = 1 ppm

NOTE:- The metric prefix ' milli ' does NOT mean a millionth,
it stands for a thousandth. See the prefix table...

#### Some associated conversion factors:-

 1 acre-foot = 43,560 cubic feet 1 acre-foot = 325,850 gallons 1 acre-foot of water = 2,718,144 pounds 1 cubic foot of water = 62.4 pounds 1 cubic foot of water = 6.24 Imperial gallons 1 US gallon of water = 8.34 pounds 1 Imperial gallon of water = 10 pounds 1 US gallon of water = 3,785 grams or 3.785 kg 1 litre of water = 1,000 grams = 1 kg (approx) 1 litre of water = 1,000 cubic centimetres (cc) 1 cubic metre = 1,000 litre 1 cubic metre = 1 metric tonne of water (appx.) 1 US fluid ounce = 29.57 grams 1 US fluid ounce = 1.043 ounces (av)

 av = avoirdupois cm = centimetres cc, cu.cm, cm3, cm^3 = cubic centimetre fl oz = fluid ounce fl pt = fluid pint fl qt = fluid quart ft = foot, feet cu.ft. , ft3, ft^3 = cubic foot gal., gals = gallon g, gm = gram gr = grain in., ins = inch, inches cu.in. in3, in^3 = cubic inch kg = kilogram lb., lbs = pound l, L = litre, liter m = metre, meter cu.m. , m3, m^3 = cubic metre oz., ozs = ounce yd., yds = yard

NOTE:- In the metric system, upper case letters usually mean something
different to lower case letters. For instance, k = kilo and K = Kelvin
Litre is an exception to avoid the small l looking like number 1; l or L is ok.

Thanks to the Mississippi State University Extension Service for some of the information.

For metric conversions go to a unit starting with -
a b c d e f g h i j k l m n o p q r s t u v w y

Related pages
 " Home page " Info on SI Units " SI Unit Descriptions " SI Derived Units " SI Prefixes (mega, giga) " Imperial/UK Units " Scientific Notation --(i.e. what is 1.00E+09)
Detail pages
 British Thermal Units Btu " Density of bulk materials " Density of liquids " Specific Gravity of water " Density of metals " Density of woods " Kitchen metric " Medical metric " Parts per million - ppm " Clothing metric " Yarn metric " Time " cc to hp " Paper & Envelopes " Gross to Nett price " Nett to Gross price " Add on Commission " Sheet metal swg - mm " Wire & rod swg - awg " Electrical wire swg - awg " Steam tables (4 pages) " Watts, amps, volts, ohms " M Threads & spanners
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