ABSTRACT
Table 5.1 Density of fresh water at atmospheric pressure
0 999.9 4 1000.0
10 999.7 20 998.2 30 995.7 40 992.2 50 988.1 60 983.3 70 977.8 80 971.9 90 965.3
100 958.4
The density of sea water depends on the locality but for general calculations the open sea may be assumed to weigh 1025 kg/m 3. In a tidal river the density varies appreciably from place to place and time to time; it is influenced by the state of the tide and by the amount of .fresh water flowing into the estuary from the higher reaches or from drains and other sources. At any one spot it may also vary through the depth of the water owing to imperfect mixing of the fresh and saline constituents.
