"[T]he statistical concept of order and disorder... was revealed by... Boltzmann and Gibbs... This too is an exact quantitative connection...entropy = k\log Dwhere k is the... and D is... the atomistic disorder of the body... The disorder... is partly... heat of motion, partly... atoms and molecules being mixed at random... e.g., sugar and water molecules... The gradual 'spreading out' of the sugar over all the water... increases the disorder D, and hence (since the logarithm of D increases with D) the entropy. ...[A]ny supply of heat increases the turmoil of heat motion, that is ...increases D... [W]hen you melt a crystal... you... destroy the neat and permanent arrangement of... atoms or molecules and turn the crystal lattice into a continually changing random distribution."
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Entropy (thermodynamics)
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