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In page Mariana Trench:

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At the bottom of the trench, the water column above exerts a pressure of 1,086 bar (15,750 psi), more than 1,071 times the standard atmospheric pressure at sea level. At this pressure, the density of water is increased by 4.96%.[citation needed] The temperature at the bottom is 1 to 4 °C (34 to 39 °F).[4]