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The density of spa-water at constant pressure depends both on the salinity and on the temperature. Ry a constant temperature it depends solely on the total salinity, as the latter always shows the same relative composition. Thence wholly equivalent expressions of the composition of sea-water may be had by means of the salinity (or the "chlorinity") and the density by a constant temperature. In stead of this density we shall speak of specific gravity. In oceanography it is represented by two different expressions: either the specific gravity of the sea-water by 0 C referred to distilled water of 4 O C (s %), or the specific gravity of the sea-water by 17,5 O C referred to distilled water of
๐ SIMILAR VOLUMES
have determined the specific gravity of aqueous solutions of orthophosphoric acid at 25 ยฐ C. compared to water at 25 ยฐ C. The twenty-four solutions used by them ranged from 3.39 per cen t. orthophosphoric acid with a specific gravity of 1.o187 to 90.26 per cent. orthophosphoric acid with a specific