Physics

pressure of a fluid. calculate the a.) absolute pressure b.) gauge pressure at an ocean depth of 1000m. Assume the density of a sea water is 1024 kg cubic meter and that the air above exerts a pressure of 101.3kPa

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  1. Absolute pressure is the pressure on a surface including atmospheric pressure.

    Gauge pressure is the additional pressure acting on a surface over and above atmospheric pressure.

    At the ocean depth of 1000 m, gauge pressure is the pressure exerted by the weight of water above the point under consideration.

    At a depth of 1000m, and ignoring the variation of g over depth, we have
    gauge pressure
    =ρgh
    =1024*9.81*1000 Pa
    =10045 kPa

    Absolute pressure is the gauge pressure plus the atmospheric pressure of 101.3 kPa, so
    absolute pressure
    = 10045+101.3
    = 10147 kPa

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