Salinity Calcluations

Robert Helling helling at
Wed Apr 10 06:36:10 PDT 2019


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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 528 bytes
Desc: Message signed with OpenPGP
URL: <>

More information about the subsurface mailing list