Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar

    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook