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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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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 10299.80,2 = 2,016 p

Fresh water has a density of 1000kg/m3

Pressure of salt water will be 10009.80.2 = 1,960 pa

Mercury has density of 13,534kg/m3

Pressure of mercury will  be 135349.80.05 = 6,631 pa

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



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