Beattie-Bridgeman s equation is a state was proposed in 1928. It has five experimentally determined constants. P=RT (1-ε) (V + B)/V<sup>2</sup> -A/V<sup>2</sup>, where p is the pressure. T is the temperature and R is the molar gas constant and A, B #038; ε are constant related to five empirical constants A<sub>0</sub>, B<sub>0</sub>, a,b,c by A=A<sub>0</sub> (1-a/V) B=B<sub>0</sub> (1-b/V).

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