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Hooke's Law. When an elastic object - such as a spring - is stretched, the increased length is called its extension. The extension of an elastic object is directly proportional to the force applied to it: F = k Ã e. F is the force in newtons, N. k is the 'spring constant' in newtons per metre, N/m. e is the extension in metres, m.
S = k ln W. 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.