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 of column of mercury

  1. Aug 7, 2006 #1
    What is the pressure of a 10 cm high column of mercury
    (ρ = 13,6 g/cm^3) in hPa?

    i know that the formula is Pressure=pgh so i subs in 13.6g/cm^3 (9.81m/s^2) (10cm).
    may i know what is the g in 13.6g/cm^3 belongs to??

    is it equals to 9.81m/s^2??
    and also what is hPa??i know Pa is pascal but don't know h

    anybody pls help
    thanx
     
  2. jcsd
  3. Aug 7, 2006 #2
    hPa is 10^2, so 100 times a Pa. And assume g is 9.81ms^-2. I'm not sure what you mean "what the 'g' in 13.6g/cm^3 belongs to" question, but g is not a variable in there, it's an indication that the density is in grams per centimeter cubed, so keep the units in centimeters and grams, and the answer should be ok.

    Levi
     
    Last edited: Aug 7, 2006
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook