1. Not finding help here? Sign up for a free 30min 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!

Comparing thermo dynamic processes

  1. Feb 18, 2013 #1
    1. The problem statement, all variables and given/known data

    in a cylinder, 1.2 mol of an ideal gas, gamma = 1.67 initially at 3.60 x10^5 pa
    and 300k, is compressed until the volume is halved.

    I need help with 1) c
    and
    2)

    Compute work done on the gas if the compression is:

    1)

    a) isothermal
    b) adiabatic
    c) isobaric

    2) in which case is the absolue value of the change in internal energy of the gas the greatest? least?

    2. Relevant equations

    I think i have a and b worked out.

    3. The attempt at a solution

    for c) would this be the correct approach?

    is this part correct?

    V1 = ?
    V2 = 1/2V1

    w = p(V2 - V1)
    w = p(1/2v - v)

    pv = nrt

    w = -1/2nrt?

    2) greatest is isobaric because?
    least is isothermal because delta u =0 constant temp and temp is related to change in internal energy.
     
  2. jcsd
  3. Feb 18, 2013 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    How can the gas get compressed if the process is isobaric? What other property must change?
     
  4. Feb 18, 2013 #3
    the volume is being compressed. But, th pressure remains constant so the area of work is less than the other 2 processes? Adiabatic is the most?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Comparing thermo dynamic processes
  1. Thermo Questions (Replies: 1)

Loading...