1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    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