Expression of Z as a Function of Reduced Pressure and Reduced Temperature

Reduced Variables

Reduced Pressure Eq. 4.1.1

Reduced temperature Eq. 4.1.2

Perry's Z Equation with Reduced Variables

Replacing P, T, PC and TC by PR and TR everywhere in Perry’s equations 4-225 and 4-227 and eliminating a and b we get:

Eq. 4.2.1

or:

Eq 4.2.2

Or, when placing the right hand side over a common denominator:

Eq. 4.2.3

And passing the denominator to the left hand side:

Passing all terms to the left hand side we get:

Eq. 4.2.4

with:

Eq 4.2.5

and:

Eq. 4.2.6