Abstract
Defining the dimensionless temperature T* as ▪ the attractive pressure term of Van der Waals equation of state has been modified by introducing a new temperature-dependent function α( T*) = 1 + pT* q The new modified Van der Waals equation predicts the saturated liquid—vapour states satisfactorily over the whole range of investigation from the triple point to the critical point. A comparison was made with experimental data for a series of selected fluids (19 compounds, 447 data point pairs) and results obtained by the use of Van der Waals and Redlich—Kwong equations, and Lielmezs, Howell and Campbell, and Soave modifications of the Redlich—Kwong equations of state.
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