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!

Why 1 liter * atm = 101.33 joules ?

  1. Dec 14, 2016 #1
    Hi !! I have been searching but i am not able to find out that is there any reason behind , why 1 liter * atm = 101.33 joules ?
     
  2. jcsd
  3. Dec 14, 2016 #2

    Nugatory

    User Avatar

    Staff: Mentor

    Are you asking why it comes out equal to 101.33 Joules, or why a pressure (atm) time a volume (liter) gives an energy (joules)?
     
  4. Dec 15, 2016 #3
    I am asking that why it is equal to 101.33 joules any logical reason or just a constant ?
     
  5. Dec 15, 2016 #4
  6. Dec 15, 2016 #5
  7. Dec 16, 2016 #6
    Even though this is not wrong, is just shifting the question to why 8.31 J equals 0.082 L*atm.
    You could just go directly to change the units for pressure and volume to SI units and get the answer.
    ## 1 atm =1.01 \times 10^5 N/m^2 ##
    ## 1L =10^{-3} m^3 ##
    So
    ## 1 atm \times 1L = 101 N \cdot m ## or 101 J
     
  8. Dec 17, 2016 #7

    CWatters

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    +1

    Consider a piston of area A moving in a cylinder with constant pressure...

    Work = Force * displacement ............ (1)

    Pressure = Force/Area
    so
    Force = Pressure * Area ....................(2)

    sub for force in (1) gives...
    Work = Pressure * Area * displacement ..............(3)

    then recognise that
    ΔVolume = Area * displacement

    so
    Work = Pressure * ΔVolume
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Why 1 liter * atm = 101.33 joules ?
  1. Torque and joules (Replies: 38)

  2. Joules and watts (Replies: 7)

Loading...