What will be the gauge pressure and the absolute pressure of water at depth 12m below the surface?

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What will be the gauge pressure and the absolute pressure of water at depth 12m below the surface?

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Answer 1 · 2015-08-09T20:02:10

(a). $117 kPa$ $117"kPa"$

(b). $217 kPa$ $217"kPa"$

Explanation:

Absolute pressure = gauge pressure + atmospheric pressure.

"Gauge Pressure" is the pressure due the liquid alone. This is given by:

$GP = ρ g h$ $"GP"=rhogh$

= $10^{3} \times 9.8 \times 12 = 1.17 \times 10^{5} N . m^{- 2}$ $10^(3)xx9.8xx12=1.17xx10^(5)N.m^(-2)$

$= 117 kPa$ $=117"kPa"$

To get the absolute pressure we need to add on the pressure due to the weight of the air above it. We add on the atmospheric pressure which I will assume to be $100 kPa$ $100"kPa"$

Absolute pressure $= 117 + 100 = 217 kPa$ $= 117 + 100=217"kPa"$

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What will be the gauge pressure and the absolute pressure of water at depth 12m below the surface?

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