PHYS 309 – Fall 2011
Chapter 3, Interactions and Implications – Review Material

(checklist of concepts and equations you should be familiar with)


Entropy, Temperature and Heat
– Qualitative definition of temperature in terms of equilibrium, and formal definition

1/T = (∂S/∂U)V, N .

– Calculating T as a function of U for simple systems.
– Calculating the heat capacity CV as a function of T for a microscopic model.
– Situations in which T < 0, how to tell from S(U) and physical meaning.
– Situations in which CV < 0, how to tell from S(U) and physical meaning.

Thermodynamical Entropy and the Third Law
– Finding entropy changes from dS = dU/T for processes with vanishing work, and

ΔS = ∫ CV dT/T.

– The third law of thermodynamics; Vanishing of CV at T = 0 and integration of S.
– Limits to the validity of the third law, and origin of residual entropy at T = 0.

Paramagnetism
– Basic definitions, expressions of U and M interms of numbers of "up" spins.
– Multiplicity of microstates Ω(n).
– Be able to calculate and plot the entropy as a function of U from Ω(n).
– Be able to calculate and plot T as a function of U.
– Be able to calculate and plot CV as a function of T.

Mechanical Equilibrium and Pressure
– Not covered yet.

Diffusive Equilibrium and Chemical Potential
– Not covered yet.


website by luca bombelli <bombelli"at"olemiss.edu>; content of this page last modified 20 aug 2011