In this equation, S is the entropy of the system, k is a proportionality constant equal to the ideal gas constant divided by Avogadro's constant, ln represents a logarithm to the base e, and W is the number of equivalent ways of describing the state of the system. Therefore, the entropy (the disorder) of the second pile is greater than that of the first pile. Entropy is one of the important concepts that students need to understand clearly while studying Chemistry and Physics. Entropy can also be related to the states of matter: solid, liquids, and gases. 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Consider the phase changes illustrated in Figure 5. It relates to the number Ω of microscopic configuration which isalso known as microstates which are consistent with the macroscopic quantitatesthat characterize the system i.e. Second Law of Thermodynamics: Introduction to Entropy Chemistry Tutorial Key Concepts. Please enable Cookies and reload the page. … Editor of Atomic, Molecular and Optical Physics Handbook. Unlike the standard enthalpies of formation, the value of S° is absolute. Professor of Physics, University of Windsor, Ontario. So if you get either head or tail … Entropy can be calculated using many different equations: 1. With regard to atomic substances, heavier atoms possess greater entropy at a given temperature than lighter atoms, which is a consequence of the relation between a particle’s mass and the spacing of quantized translational energy levels (which is a topic beyond the scope of our treatment). 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