By Don S. Lemons

Striving to discover the topic in as uncomplicated a fashion as attainable, this booklet is helping readers comprehend the elusive notion of entropy. cutting edge features of the ebook comprise the development of statistical entropy from wanted houses, the derivation of the entropy of classical platforms from in basic terms classical assumptions, and a statistical thermodynamics method of the correct Fermi and excellent Bose gases. Derivations are labored via step by step and demanding functions are highlighted in over 20 labored examples. round 50 end-of-chapter routines attempt 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 learn. it really is a great complement to undergraduate classes in physics, engineering, chemistry and mathematics.

Focuses on foundations and illustrative examples to assist readers comprehend the starting place and reasons of the concept that of entropy

Treats entropy throughout a variety of themes, from thermodynamics, classical and quantum statistical mechanics, and knowledge theory

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

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

**Example text**

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.

For if the entropy is a function of the independent variables E and V so that S = S(E,V), then its multivariate differential is ⎛ ∂S ⎞ ⎛ ∂S ⎞ dS = ⎜ ⎟ dE + ⎜ dV . 28) (Here (∂ ∂ )V means the derivative of S with respect to E while holding V constant. This use of subscripts in this way, common in thermodynamics texts, has the advantage of reminding us, in this case, that E and V are the two independent variables. 29) P ⎛ ∂S ⎞ ⎜⎝ ⎟ = . 176 on Wed Oct 15 17:28:53 BST 2014. 30). 30) show us how, by taking derivatives of the entropy function S (E,V), to derive luid equations of state that observe the irst and second laws of thermodynamics.

In the irst sequence the particles of a gas are conined to one half of a space by an impenetrable barrier, the barrier is removed, and the gas particles ill the space available. In the second, two identical bodies with different temperatures, TH and TC < TH, are separated by an adiabatic barrier, the barrier is removed, and the two bodies approach thermal equilibrium. Dependence of entropy on macrostate multiplicity In each of these irreversible transitions the entropy of a macrostate of an isolated system increases from an initial value Si to a inal value Sf > Si in accordance with the second law of thermodynamics.