If the atmospheric pressure is 101 kN/m^2 , what is the absolute pressure of water at depth of 12 m below the surface?

1 Answer
A08
May 6, 2018

Gauge Pressure #"GP"# is termed as the pressure due the liquid alone. This is given by the equation

#"GP"=rhogh#
where #rho# is density of fluid, #g=9.81\ ms^-2#, acceleration due to gravity and #h# height of liquid column.

Inserting various values we get

#"GP"= 10^(3)xx9.81xx12=117.72\ kN.m^(-2)#

Now

#"Absolute pressure" ="GP"+"atmospheric pressure"#
#=>"Absolute pressure" =117.72+101#
#=>"Absolute pressure" =219\ kN.m^(-2)#, three significant figures.

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