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7 December, 13:04

Rank the pressure from highest to lowest (a) bottom of a 20-cm tall container of salt water, (b) bottom of a 20 cm-tall container of fresh water, and (c) bottom of a 5-cm tall container of mercury

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  1. 7 December, 13:06
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    The answer is C, A, B in that order.

    Pressure = Density * gravity * height.

    Let us look at these three substances and assume gravity is 9.8 m/s squared.

    The Salt water has a density of 1029kg/m3, height of 0.2 meters.

    Pressure of salt water will be 1029*9.8*0,2 = 2,016 p

    Fresh water has a density of 1000kg/m3

    Pressure of salt water will be 1000*9.8*0.2 = 1,960 pa

    Mercury has density of 13,534kg/m3

    Pressure of mercury will be 13534*9.8*0.05 = 6,631 pa

    So mercury exerts the highest pressure even at only 5cm height.
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