• Lalit Kumar

Entropy is a measurement of disorder in any thermodynamic system.Clausius introduced the concept of entropy in mid nineteen century and since then it has been continuously enriched our concepts regarding different branches of science. Concept of thermodynamic entropy was introduced by L.Boltzmann, and according to him thermodynamic entropy is directly proportional to logarithm of the number of microstates of the system. In this research paper we have discussed applications of this resultin Maxwell Boltzmann, Bose Einstein and Fermi Dirac statistics. In statistical mechanics Helmholtz function, entropy and partition function are directly linked together with different relations. Using this concept we have evaluated partition function, Helmholtz function and entropy for quantum mechanical harmonic oscillator, classical harmonic oscillator, paramagnetic and paraelectric substances, ideal and relativistic classical gas, black body radiation, monoatomic gasses in different dimensions, rotational motion etc. A brief analysis of entropy with the help of Gibbs free energy and entropy in grand canonical ensemble is also done..

Entropy,Helmholtz function,Gibbs free energy,classical gas etc

"Statistical review of entropy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.1, Issue 4, page no.911-922, September-2014, Available :http://www.jetir.org/papers/JETIR1701545.pdf

"Statistical review of entropy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.1, Issue 4, page no. pp911-922, September-2014, Available at : http://www.jetir.org/papers/JETIR1701545.pdf