By Don S. Lemons

Striving to discover the topic in as easy a fashion as attainable, this e-book is helping readers comprehend the elusive notion of entropy. leading edge elements of the ebook contain the development of statistical entropy from wanted homes, the derivation of the entropy of classical structures from basically classical assumptions, and a statistical thermodynamics method of the appropriate Fermi and perfect Bose gases. Derivations are labored via step by step and demanding functions are highlighted in over 20 labored examples. round 50 end-of-chapter workouts try out readers' knowing. The ebook additionally includes a thesaurus giving definitions for all crucial phrases, a time line exhibiting vital advancements, and record of books for additional research. it really is a fantastic complement to undergraduate classes in physics, engineering, chemistry and mathematics.

Focuses on foundations and illustrative examples to aid readers comprehend the foundation and reasons of the concept that of entropy

Treats entropy throughout various themes, from thermodynamics, classical and quantum statistical mechanics, and data theory

Gives extended derivations, taking readers via every one step-by-step

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**Extra info for A Student's Guide to Entropy**

**Sample text**

3 Fundamental postulate According to the fundamental postulate of statistical mechanics: the microstates of an isolated thermodynamic system are equally probable. 1 has 8 microstates consistent with its description and each, according to the fundamental postulate, is equally probable, the probability that this system realizes any one of these 8 microstates is 1/8. Furthermore, because the macrostate with exactly two particles on its right side is realized in 3 out of 8 equally probable microstates, the probability of this macrostate is 3/8.

Thus, one can measure the energy and entropy increments ∆E and ∆S by carefully controlling and measuring the energy transferred to or from a system by heating and cooling or by having work done on or by a system. Yet energy and entropy play different roles within the science of thermodynamics. The energy of an isolated system remains constant, while the entropy of an isolated system cannot decrease. The third law of thermodynamics identiies another behavior of entropy that has no energetic parallel.

And the number of spatial microstates available to two distinguishable particles increases by 2 2 . Therefore, the multiplicity of the N-particle system increases by 2 N during this Joule expansion. Consequently, the ratio of the inal to the initial macrostate multiplicity is Ωf Ωi = 2N , and the entropy is incremented by Sf ⎛ Ωf Si = k ln ⎜ ⎝ Ωi ΔS ⎞ ⎟⎠ , ⎛ Ωf ⎞ k ln ⎜ ⎝ Ωi ⎟⎠ = Nk ln 2. Apparently each particle contributes k ln 2 to the entropy increment. 3 A paradox Problem: Consider a system of 2N identical, classical particles initialized with N particles in the left of two equal-volume chambers and N in the right.