[jason210]

Temperature and the amount of salt present are two seperate variables. You cannot determine one from the other. However, both varibale scan be used to calculate the density of the water.

If you know the temperature of a water sample, and know the salinity density of the same water sample, then you can use those two variables to calculate the density of the water sample, which can then be used in a further buoyancy calculation. This final calculation could then enable the crew to predict the trim tanks settings.