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Even in oceans at 4 km depth, where the pressure is 400 atm, water suffers only a 1.8% decrease in volume. [ 100 ] The viscosity of water is about 10 −3 Pa· s or 0.01 poise at 20 °C (68 °F), and the speed of sound in liquid water ranges between 1,400 and 1,540 metres per second (4,600 and 5,100 ft/s) depending on temperature.