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
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