question for "pptM". Very confusing of this meaning

[Jaehwan Lee]

Is there anybody who know this meaning?
pptM means "parts per trillion by mass? Am I right?
If so, can I convert pptM to ppbV?
I'm so confused of this meaning.
Would it be possible to let me know? If possible, I wanna get the example from anybody.
B.regards.
J.H. Lee

[Peter Apps]

"pptM" is meaningless, though your guess about what is is supposed to mean might be accurate.

To correct mass to volume you need to know density, or molecular weight if you are working with gasses.

Using the SI system of units avoids exactly this kind of confusion.

Peter

[Jaehwan Lee]

Thanks for your comments.
It's good understading for me.
Thanks. Peter