It does help! Thanks Robert. On Wed, 10 Apr 2019 at 14:36, Robert Helling <[email protected]> wrote:
> Rob, > > > On 10. Apr 2019, at 15:16, Rob Mason <[email protected]> wrote: > > > > I'm working my way through the Buhlmann model with a view to extending > the planning functionality of SubSurface (purely self-interest in deco > theory). I'm trying to understand the salinity variance, which I think > comes from Schreiner extensions to the Buhlmann model? In core/dive.c water > pressure calculations, what does the value 0.981 represent? > > > > Dirk - you answered (thanks) - "that's gravity. We need the weight, not > the mass.". To confirm, this is using kN??? i.e. the standard specific > weight of water? I wanted to be absolutely sure. > > yes, we are looking for a pressure which is force per area, so we need the > gravitational force exerted by the water column which is 9.81 m/^2 times > its mass. The salinity is actually the mass of one liter of water. > > Hope that helps. > > Robert > _______________________________________________ > subsurface mailing list > [email protected] > http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface >
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