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Water is compressible, but it takes a lot of pressure to increase the density by 10 or 20%
Deep Ocean pressure measurements
http://nctr.pmel.noaa.gov/Dart/Pdf/Eble_J_atmo_91.pdf
http://seagrant.gso.uri.edu/factsheets/abyss.html
http://www.windows2universe.org/earth/Water/density.html
http://www.csgnetwork.com/water_density_calculator.html
Pure water would have a density of 1205.154 kg/m3 at pressure = 1086 bar
1086 bars (15750 psi) from en.wikipedia.org/wiki/Mariana_Trench
or a density of 1100 kg/m3 at pressure at 263.835 bar, which is about 20% higher than the pressure in a PWR.
Salt water has a maximum density of ~12700 kg/m3.
Deep Ocean pressure measurements
http://nctr.pmel.noaa.gov/Dart/Pdf/Eble_J_atmo_91.pdf
http://seagrant.gso.uri.edu/factsheets/abyss.html
http://www.windows2universe.org/earth/Water/density.html
http://www.csgnetwork.com/water_density_calculator.html
Pure water would have a density of 1205.154 kg/m3 at pressure = 1086 bar
1086 bars (15750 psi) from en.wikipedia.org/wiki/Mariana_Trench
or a density of 1100 kg/m3 at pressure at 263.835 bar, which is about 20% higher than the pressure in a PWR.
Salt water has a maximum density of ~12700 kg/m3.
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