Abstract
The second virial coefficient for pure compound is correlated as a power series of the reduced temperature. The three parameters of the equation were calculated by computer and in the calculations of second virial coefficients with all the substances investigated the errors were less than 5% over a substantially wide temperature range.
According to an assumed combination rule, the second virial cross coefficients are considered briefly.
With these second virial coefficients, an effect of the vapor-phase imperfection on vapor-liquid equilibrium has been investigated.
