Calculate the absolute pressure at the bottom of a freshwater lake at a point whose depth is 27.8 m. assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kpa.
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The relative pressure at the bottom of the lake is given by where is the water density g is the gravitational acceleration h is the depth at which the pressure is measured At the bottom of the lake, h=27.8 m, so the relative pressure is To find the absolute pressure, we must add the atmospheric pressure, , to this value: