text: Empirically, constants in this equation are related to the reduced temperature raised to the negative 1.6 andnegative 4.2 powers.
full_question: Empirically, constants in this equation are related to the reduced temperature raised to the negative 1.6 andnegative 4.2 powers. In this equation, a certain parameter times P over RT is equal to the residual Gibbs energyand, therefore, the logarithm of the fugacity coefficient. The constants in this equation get a prime whenthey're expressed using pressures. The Boyle temperature can be derived when it is truncated to one term.Kamerlingh Onnes proposed this equation and showed that after the first two terms, its coefficients areindependent of temperature. It gives the compressibility factor as one plus a power series of volume. For 10points, name this infinite-series equation of state contrasted with cubic equations of state. 
first_sentence: Empirically, constants in this equation are related to the reduced temperature raised to the negative 1.6 andnegative 4.2 powers.
raw_answer:  virial equation of state