Total pressure of water against submarine

  • Thread starter chawki
  • Start date
  • #1
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Homework Statement


What is the total pressure (absolute pressure) against the porthole of a submarine, when the
submarine is at a 35 m depth, and the density of the seawater is 1020 kg/m3. Air pressure is 1
bar and 1 bar = 1×105 Pa. Give the result using unit bar.

Homework Equations


Total Pressure


The Attempt at a Solution


PV=nRT ?
 

Answers and Replies

  • #2
rock.freak667
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The Attempt at a Solution


PV=nRT ?
That is for gases.

What is the equation for the pressure given at a certain depth in a fluid? (Hint: The question has most of the relevant quantities that you need in this question)
 
  • #3
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I don't know the equation, and couldn't get anything from the question..except the difference of pressure.
 
  • #4
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ah yesyes...maybe P=density*g*height
 
  • #5
rock.freak667
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ah yesyes...maybe P=density*g*height
Right that gives the pressure at the depth 'h'. So at depth 'h', you have that pressure acting in addition to what other pressure?
 
  • #6
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I think the Total pressure would be:
Ptotal=P0+P
Ptotal=105+(1020*9.8*35)
Ptotal=449860 Pa
and that's 4.4986 Bar
 
  • #7
rock.freak667
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That should be correct.
 
  • #8
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Thank you :biggrin:
 

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