1 / 7

Thermal Physics II

Thermal Physics II. Part 2 A) Thermodynamic Potentials & Maxwell Relations B) Statistical Thermodynamics. http://ppewww.ph.gla.ac.uk/~parkes/teaching/TP/TP.html. Chris Parkes. Thermodynamic Potentials & Maxwell Relations. Maxwell Relations from 1 st Laws for U,H,F,G Heat Capacities

rhett
Download Presentation

Thermal Physics II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Thermal Physics II Part 2 A) Thermodynamic Potentials & Maxwell Relations B) Statistical Thermodynamics http://ppewww.ph.gla.ac.uk/~parkes/teaching/TP/TP.html Chris Parkes

  2. Thermodynamic Potentials& Maxwell Relations • Maxwell Relations from 1st Laws for U,H,F,G • Heat Capacities • Joule-Kelvin Process • Joule-Kelvin Co-efficients • Inversion Temperature • Inversion Curve for Real Gas • Practical Joule Kelvin Effect • Phase Changes (use of Gibbs function, Phase Diagrams) • Clausius Clapeyron Equation • Vaporisation Curve • 1st order Phase Transitions • 2nd Order phase Transitions

  3. Thermodynamic Potentials Potential Definition First Law Internal Energy: U(S,V) dU=Tds-PdV Enthalpy: H(S,P) H=U+PV dH=Tds+VdP Helmholtz fn: F(T,V) F=U-TS dF=-SdT-PdV Gibbs fn: G(T,P) G=U+PV-TS dG=-SdT+VdP

  4. Maxwell Relations First Law Maxwell Relation dU=Tds-PdV dH=Tds+VdP dF=-SdT-PdV dG=-SdT+VdP

  5. P, V, T P’ Throttling Process Piston P’, V’, T’ P

  6. PVT Surface • Water expands on freezing (as shown here) • Most substances contract

  7. T-P Water • Triple point at 612Pa, 0.010C • -ve slope for ice - water is unusual • Actual phase diagram more complex – • since also crystalline forms of ice, multiple triple points

More Related