Unit for parts per thousand.
1 This represents as near 20 per mille of chlorine as possible.
2 Thus, where the temperature is 12° C., the water almost invariably has a salinity very near 35 per mille .
3 Thus, where the temperature is 12º C., the water almost invariably has a salinity very near 35 per mille .
4 Lines connecting points with the same salinity (isohalins) are drawn unbroken, and, in addition, salinities above 35 per mille are shown by shading.
5 At 100 metres the difference was even greater than 0.5 per mille ; this is a great deal in the same region of open sea.
6 3, two great volumes of water, from the surface down to depths greater than 500 metres, which have salinities between 35.4 and 35.5 per mille .
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