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: PV = nRT; units

  1. Feb 3, 2009 #1
    When using the ideal gas law equation and solving for V, with constant R = 8.314 J·mol−1·K−1, what are the resultant units? L or m3?

    I always remember it being in L, but wouldn't it be m3 based purely on the units being put into the equation?

    Other units I'm using:

    P: Pa (not kPa)
    T: K
    Last edited: Feb 4, 2009
  2. jcsd
  3. Feb 4, 2009 #2


    User Avatar

    Staff: Mentor


    Trust your units :smile:

    For L one uses 8.314x103
  4. Feb 4, 2009 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Alternatively, there's also the other commonly used unit system, seen in R=0.0821 L-atm/(K-mol)
  5. Feb 4, 2009 #4


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    what you need to know to answer the question is that [itex] 1 Pa = 1 N/m^2 [/itex] (Newton per meter squared) and that [itex] 1 N = 1 J/m [/itex] so that [itex] 1 Pa = 1 J/m^3 [/itex] which shows that V comes out in [itex] m^3 [/itex]
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook