Evaluation of the reduced variables

The reduced variables v, p and fcan be evaluated from measurements of the coefficient of thermal expansion a and compressibility These are defined by 

Once V is known, f, and perforce T, can be calculated from the equation-of-state with p 0. The value of p is calculated from p = ajK T and this leads to p. If required, c can be calculated from p v =ckT but its actual value, as noted previously, is of little physical s  

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