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

1 Answer
Michael
Aug 9, 2015

(a). #117"kPa"#

(b). #217"kPa"#

Explanation:

Absolute pressure = gauge pressure + atmospheric pressure.

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

#"GP"=rhogh#

= #10^(3)xx9.8xx12=1.17xx10^(5)N.m^(-2)#

#=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"#

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

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