A parametric representation of the usual thermodynamic variables in the neighborhood of a critical point is proposed in terms of new variables r and θ. The representation is chosen so that the "scaling-law" behavior is entirely contained in the r dependence, the θ dependence being free of critical singularities. Preliminary calculations show that the θ dependence may be chosen to have a rather simple form both in a ferromagnet and in fluids.
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Peter Schofield (1969) studied this question.
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