Aktueller Inhalt von Alex_W

Hi Tom, thanks for the explanation. it seem that engineers just use the unit ppm differently. one part means for me one atom, or molecule. But knowing now that you use it for milligram per liter (or kg, for water based solutions there is luckily no significant difference) i can now calculate...

Hi Tom, I registered to this forum just to get this question answered (although i think, as an interested Fish-keeper i'll stay longer ;-))... I'm a scientist too, and i use the unit ppm different from how you do: i always considered the only meaning of the unit as parts per million...