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Ludwig Eduard Boltzmann (February 20, 1844 – September 5, 1906) was an Austrian physicist whose greatest achievement was in the development of statistical mechanics, which explains and predicts how the properties of atoms (such as mass, charge, and structure) determine the visible properties of matter (such as viscosity, thermal conductivity, and diffusion).


It's written on Ludwig Boltzmann's tombstone, and it means that "entropy is the logarithm of multiplicity." It's a thermodynamics and statistical mechanics fact.