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 07-29-2003, 10:17 AM #1 PharCyde Algae Grower   PTrader: (0/0%) Join Date: Nov 2002 Location: Australia Posts: 41 I always forget this does 1mg/L = 1ppm OR 10ppm? Cheers

 07-29-2003, 12:19 PM #2 Rex Grigg Planted Tank Guru     PTrader: (65/100%) Join Date: Dec 2002 Location: Portland Orygun Posts: 9,600 1 ppm
 07-29-2003, 03:53 PM #3 Wasserpest Are these real?     PTrader: (182/100%) Join Date: Jun 2003 Location: Monterey, CA Posts: 15,299 1 ppm = 1 part per million 1 liter = 1000 grams = 1,000,000 milligrams Therefore, 1 milligram per liter equals 1 part per million. ... the metrical system... too logical to be understood... :mrgreen: __________________
 07-29-2003, 08:14 PM #4 Doomer Planted Tank Obsessed   PTrader: (0/0%) Join Date: Jan 2003 Location: The Boondocks Posts: 468 It's easy to understand if you've never been corrupted by that "other" system.
 07-29-2003, 08:21 PM #5 Wasserpest Are these real?     PTrader: (182/100%) Join Date: Jun 2003 Location: Monterey, CA Posts: 15,299 I know :roll: I had/wanted to get used to the "other" system, and even after 7 years I am lost in between Celcius and Fahrenheit :? __________________
 07-29-2003, 08:32 PM #6 mario Planted Member     PTrader: (0/0%) Join Date: Feb 2003 Location: Boston, MA, USA Posts: 287 Same here Wasserpest. I've been in the States for 7 years and I only know 0C=32F and 37C=98F. Everything in between I just have to guess.
 07-29-2003, 08:38 PM #7 Wasserpest Are these real?     PTrader: (182/100%) Join Date: Jun 2003 Location: Monterey, CA Posts: 15,299 The two marks I remember are 68 = 20 = too cold for fishies 86 = 30 = too warm for fishies I am glad I don't have to deal with Kelvin as well :lol: __________________
07-29-2003, 08:44 PM   #8
Saluki
Algae Grower

Join Date: Jun 2003
Location: Springfield, Illinois, USA
Posts: 70

Quote:
 Originally Posted by Wasserpest 1 ppm = 1 part per million 1 liter = 1000 grams = 1,000,000 milligrams Therefore, 1 milligram per liter equals 1 part per million. ... the metrical system... too logical to be understood... :mrgreen:
In the interest of accuracy, I want to point out that this is fairly true in the limited case of a dillute aqueous solution, which we have in an aquarium. In general, 1 ppm is not necessarily equal to 1 kg/liter. It all depends on what solvent/solute you are talking about. Even if water is your solvent, it will not weigh 1000 kg/liter in concentrated solutions.

So, yes, in fishkeeping terms, it is accurate enough, but it is not always accurate.

 07-29-2003, 09:28 PM #9 m.lemay Planted Tank Guru     PTrader: (9/100%) Join Date: Jul 2002 Location: Naugatuck, CT. Posts: 2,647 Water weighs 1000 grams per liter or 1 KG per liter. 1000kg is a metric ton. [/quote] __________________ FILSTAR Pimp #2 75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
07-29-2003, 09:55 PM   #10
Wasserpest
Are these real?

Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,299

Quote:
 Originally Posted by Saluki Even if water is your solvent, it will not weigh 1000 kg/liter in concentrated solutions.
Not even close :lol:

You are right, a liter of mercury will weight much more than 1 kg, and for aquaristic use this equation is still close enough. Thanks for clarifying. :mrgreen:
__________________

 07-29-2003, 09:56 PM #11 Saluki Algae Grower   PTrader: (0/0%) Join Date: Jun 2003 Location: Springfield, Illinois, USA Posts: 70 ops: Edited typo. My point is that pure water at room temperature weighs about 1000 mg/liter. If you go outside that range by either changing the temperature, or by adding other substances to the water, then the density changes, and therefore 1 ppm no longer equals 1 mg/kg. A prime example I just thought of is a marine tank. 1 ppm would definitely not be equal to 1 mg/liter in a SW set up.
 07-29-2003, 10:13 PM #12 m.lemay Planted Tank Guru     PTrader: (9/100%) Join Date: Jul 2002 Location: Naugatuck, CT. Posts: 2,647 The entire metric system was based on the physical properties of Pure water.. Water freezes at 0 celcius and boils at 100. 1 ml of h2o weighs a gram and 1cubic millimeter=1ml=i gram and so on. But this only works for pure h2o. Other substances have different densities which throw off the whole lineal relationship as in the salt in salt water. 8) __________________ FILSTAR Pimp #2 75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
 07-30-2003, 12:08 PM #13 Deuce868 Algae Grower   PTrader: (0/0%) Join Date: Jul 2003 Location: Michigan Posts: 105 I remember when I was in school all of our teachers told us we would be using the metric system by the time we got out of school. Hmmm...I think I missed the change somewhere. __________________ ---------- Eheim Pimp Member # 117
 07-30-2003, 01:28 PM #14 PharCyde Algae Grower   PTrader: (0/0%) Join Date: Nov 2002 Location: Australia Posts: 41 Thankyou. It was late at night and i couldnt remember. I worked that out but just wanted a clarification Cheers

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