Is there a difference between ppm and mg/l?

kakkoii · 05-16-2008, 09:57 AM

Is there a difference between ppm (parts per million) and mg/l (milligrams per liter)? Everywhere I have looked said they equal the same amount. Is this true?

Anti-Pjerrot · 05-16-2008, 12:23 PM

If its a solution in water there is no difference since 1ml water weighs 1gram.
If the solution has another density than 1 there is a difference.

kakkoii · 05-16-2008, 12:40 PM

Thank you! I got the same answer on APC.

beaslbob · 07-07-2008, 01:59 PM

I know this thread has been dead for awhile but I am curious.

sure mg/l is 1ppm but that would be mass based.

for a ppm based on ions or molecules, wouldn't you have to adjust for the mecular weights?

If so how?

my .02

05-16-2008, 09:57 AM	#1 (permalink)
kakkoii Senior Aquascaper Join Date: Feb 2008 Location: New England, USA Posts: 310	Is there a difference between ppm and mg/l? Is there a difference between ppm (parts per million) and mg/l (milligrams per liter)? Everywhere I have looked said they equal the same amount. Is this true? __________________ Drew -------------------------------------------------- AquaScaping World

05-16-2008, 12:23 PM	#2 (permalink)
Anti-Pjerrot Moderator Join Date: Feb 2008 Location: Copenhagen, Denmark Posts: 378	If its a solution in water there is no difference since 1ml water weighs 1gram. If the solution has another density than 1 there is a difference. __________________ Scape it - Kristoffer

05-16-2008, 12:40 PM	#3 (permalink)
kakkoii Senior Aquascaper Join Date: Feb 2008 Location: New England, USA Posts: 310	Thank you! I got the same answer on APC. __________________ Drew -------------------------------------------------- AquaScaping World

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07-07-2008, 01:59 PM	#4 (permalink)
beaslbob Junior Aquascaper Join Date: Mar 2008 Location: huntsville, al Posts: 8	I know this thread has been dead for awhile but I am curious. sure mg/l is 1ppm but that would be mass based. for a ppm based on ions or molecules, wouldn't you have to adjust for the mecular weights? If so how? my .02