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445lec31 - PHYS 445 Lecture 31 Interactions Phase...

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PHYS 445 Lecture 31 - Interactions: Phase transitions 31 - 1 © 2001 by David Boal, Simon Fraser University. All rights reserved; further resale or copying is strictly prohibited. Lecture 31 - Interactions: Phase transitions What's Important: galaxy formation galactic evolution Text : Reif Phase transitions Most of the systems considered so far in this course have consisted of non-interacting particles: we have calculated distribution functions, specific heats etc for MB, BE and FD statistics, and the special case of photons. In general, the behavior of all the quantities calculated has been smooth: microscopic macroscopic Up to now, the one exception has the condensation of 4 He atoms to form a superfluid F = 1 n i C v T 2 4 T (K) liquid He I liquid He II He gas pressure 20 atm
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PHYS 445 Lecture 31 - Interactions: Phase transitions 31 - 2 © 2001 by David Boal, Simon Fraser University. All rights reserved; further resale or copying is strictly prohibited. For 4 He, there is a phase transition - the discontinuous change in the amount of one component of a system and/or the discontinuous change in an observable such as the specific heat.
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