[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Aquatic Plants Digest V3 #344
Hello All:
My two cents worth (about 0.32 cents US)
> Also, isn't there some difference of opinion between some countries as to
> which is larger - million or billion? This may lead to misunderstanding when
> using PPM.
Nope: The confusion is between American Billion (1000 million) and
Euro Billion (Million million). 1000 million is called a Milliard in
Europe.
> And finally, we toss about the terms mg/l, PPM and Metric system as if they
> were all consistent. One would think that mg/l would be a Metric system
> measure but isn't "parts per million" rather system independent? Just a
> semantic nit, really.
Rather large Nit actually. For waying out chemicals, mg/l works best,
which you calculate from Mols/l. PPM works nicely if your
measurements are liquid, but its really unnecessary.
Jacques
___________________________________________________
Jacques Gerber
Botany Department
Rhodes University
Grahamstown
6140
South Africa
Dept Tel#: 046 6038596
Dept Fax#: 046 6225524
Home Tel#: 046 6225000
___________________________________________________