Salinity Calcluations

[Rob Mason]

It does help!  Thanks Robert.

On Wed, 10 Apr 2019 at 14:36, Robert Helling <helling at atdotde.de> wrote:

> Rob,
>
> > On 10. Apr 2019, at 15:16, Rob Mason <robmason38 at googlemail.com> 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
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