Posted by Dave W on July 10, 2000 at 20:11:40 from dewaller.demon.co.uk:
In Reply to: Re: Semaphore & other important matters posted by Mike Field on July 09, 2000 at 13:29:14:
So is gas concentration ppm expressed as a volumetric or gravimetric ratio?
(This topic could be thought to be rather outside the scope of Tarboard but I think Messrs Stedding and Callum might approve.)