Pressure 1m below water surface: absolute or gauge pressure

[vaxopy]

Very simple question - is pressure 1m down in water...

is it pgh?? (1000*9.81*1)...

or is it P2 = P1 + pgh.. that is.. (101.3kPa) + (1000*9.81*1)


im so confused :/

 

[dextercioby]

Yes.I'm confused,too,because you used the letter "p" both for pressure (good thing) and for mass volumic density (bad thing)...

Daniel.

 

[vaxopy]

the small p is rho

and i figured it out :)
its the 2nd eqn

 

[dextercioby]

Of course,that's the total pressure acting on a body immersed in a fluid.However,you might have noticed it's ~11/10 times larger than the one due to air at Earth's surface,which means a difference of ~0.1 atm due to fluid pressure...

Daniel.