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3 November, 14:01

f the absolute pressure in a tank is 128 kPa, determine the pressure head in mm of mercury. The atmospheric pressure is 100 kPa. The density of the mercury is 13,550 kg/m3. Express your answer using three significant figures.

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  1. 3 November, 15:57
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    211 mmHg

    Explanation:

    Absolute Pressure = Gauge Pressure + Atmospheric pressure

    128 = Gauge Pressure + 100

    Gauge Pressure = 28 KPa = 28 * 10³ Pa

    Also Gauge Pressure = ρgh

    ρ = density = 13550 kg/m³

    g = acceleration due to gravity = 9.8 m/s²

    h = pressure head = ?

    28 * 10³ = 13550 * 9.8 * h

    h = 28000 / (13550 * 9.8)

    h = 0.211 m = 211 mm
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