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Homework Help: Pressure above & below the surface of a lake.

  1. Mar 21, 2007 #1
    At the surface of a freshwater lake the pressure is 106 kPa. (a) What is the pressure increase in going 35.1 m below the surface? (b) What is the approximate pressure decrease in going 34 m above the surface? Air at 20°C has density of 1.2 kg/m3.

    i was almost sure that i needed to use this equation: P=P(atm)+ pgd but for some reason it is saying that it is wrong
    please help
     
  2. jcsd
  3. Mar 22, 2007 #2

    SGT

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    If it is demanded the pressure increase, you don´t have to add the atmospheric pressure.
     
  4. Mar 22, 2007 #3
    so you are sayng that it is P=pgd?
     
  5. Mar 22, 2007 #4
    omg that is the right answer, thank you
     
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