Posted by Ian E-N on July 11, 2000 at 09:04:52 from es-electronics.lancs.ac.uk:
In Reply to: Re: Semaphore & other important matters posted by Mike Field on July 11, 2000 at 02:35:22:
>My understanding is that it is volumetric
Environmental Science wise, normally so - ppmv for gas, ppmm for soils and such.
http://www.civil.mtu.edu/~reh/courses/ce251/251_notes_dir/node2.html
http://www.faculty.mcneese.edu/wyman/es102/es102spr2000notes3.htm