And to be clearer, a “part per gram” is not a “mg per gram” or a “mole per gram” or a “milliequivalent per gram” - all of which would actually have clear scientific meaning. But none of the above is what you said. You said “parts per gram” and “that’s how it’s measured.”
Sorry. That’s just wrong.
I actually did make one math mistake which no one has pointed out so far. Not sure if anyone caught it. Did you?
OK. Sorry. It’s driving me nuts - can’t wait to see if anyone even cares to look or even if they do if they’ll find it.
Post #78
“Yeah - that’s mg/L or parts per million - they are the same thing.”
That’s wrong, probably by less that a factor of ten in almost any real-world case, but it’s wrong. I typed mg/L, but in my brain, because these discussions are so often about aqueous solutions, my brain saw mg/kg, because one L of water is a kg. The latter is absolutely true - mg/kg is absolutely a part per million by weight. But an mg/L isn’t the same thing.