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**To**:**<Aquatic-Plants at actwin_com>****Subject**:**RE: mg/L or Ppm****From**:**"Joe Kopanski" <kopanski at earthlink_net>**- Date: Thu, 2 May 2002 22:41:37 -0400
- Importance: Normal
- In-reply-to: <200205020748.g427m2600901 at acme_actwin.com>

The Amazing Metric System <http://ts.nist.gov/ts/htdocs/200/202/mpo_home.htm> CGS = centimeter-gram-second system Volume “L” is the abbreviation for “Liter” which is also 1000 cubic centimeters which is written as cm^3 (never use cc!) “mL” = milli-Liter = 1/1000 of a liter = 1 cm^3 Length “m” = meter “cm” = centi-meter = 1/100 m Mass “g” = gram “mg” = milli-gram = 1/1000 of a gram 1000 g = 1 kg = 1 kilo-gram Time ”s” = second Density of water is 1 g/cm^3 1 Liter of water = 1,000 cm^3 of water = 1,000 g of water = 1 kg of water 1 m^3 of water = 100 x 100 x 100 cm^3 = 1,000,000 cm^3 = 1,000 kg = 1 tonne (metric ton) 1 mg of substance dissolved in 1 Liter of water = = 1 mg/L = = 1 mg substance in 1,000 g water = = 1/1,000 g substance in 1,000 g water = = 1 part substance in 1,000 x 1,000 parts water = 1 part per million (ppm) Quiz: 1) 1 g of Potassium in 200 L of water gives you how many mg/L of Potassium? A: 1000 mg/200 L = 5 mg/L = 5 ppm 2) 1/4 tsp. of Potassium in 55 gallons of water gives you how many ppm of Potassium? A: I have no idea. 3) How much Potassium Sulfate does your 55 Gallon plant tank need? A: A big pinch every couple of days. Try more or less and see what happens. (and let’s not get into how much K is in 1 g of K2SO4!)

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