A set of nine solutions whose chemical composition is approximately that of sea water has been studied for its sound‐velocity temperature dependence at atmospheric pressure. The compositions differ drastically from one another in their proportions of magnesium and sulfate ions, but all have the same total weight of dissolved solids. Final results enable one to estimate the effect upon sound velocity of the small differences in chemical composition that have been shown by the recent work of Cox to exist in typical sea water. The effect is quite small and is minimized best by using a measure for salinity that reflects the total weight of dissolved solids. It is shown that, among the compounds making up sea water, their contributions to its sound velocity bear roughly similar proportions to their contribution to its salinity.

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