Boltzmann is perhaps the most significant contributor to kinetic theory, as he introduced many of the fundamental concepts in the theory. Besides the Maxwell–Boltzmann distribution mentioned above, he also associated the kinetic energy of particles with their degrees of freedom . The Boltzmann equation for the distribution function of a gas in non-equilibrium states is still the most effective equation for studying transport phenomena in gases and metals. By introducing the concept of thermodynamic probability as the number of microstates corresponding to the current macrostate, he showed that its logarithm is proportional to entropy.
The ThermoLit web application provides free and open access to literature information contained in the NIST SOURCE Data Archive [Int. J. Thermophys., 2012, Vol. 33, No. 1, p. 22-33.] and provides an easy-to-use tool for generation of a NIST Literature Report in PDF format. The tool is intended to aid researchers and reviewers in determining relevant literature sources for a given thermophysical property measurement; however, it is not intended to replace the comprehensive literature review required by all journals, and no guarantee is made regarding completeness of the information provided. The primary focus of this service is molecular organic compounds. Some common inorganic and organometallic compounds are included, but, in general, polymers, radicals, ions, salt and acid solutions, metals, metal oxides, and inter-metallics are not considered.