Hi can someone h elp me please, im a bit thick. how is 500 grams per 10,000 litres expressed as parts per million. i know tht 1ppm is 1mg /liter(like i said im thick...))

thanks.

Tokolosh

first you have to convert 500 grams into miligrams. You can do this by multiplying by 1000. So, you have 500,000 milligrams. Now, simply divide by 10,000 and that's your answer.

Hey Ecoli, thanks for your help dude. i get mathematical dyslexia. much appreciated.

cya tokolosh

no problem... it's a simple calculation, but you have to think of it one step at a time.