Lee-Kesler Generalized Correlations for Gases

component

methane

reduced temperature

T

r

1.4

reduced pressure

P

r

3

General

:Exp[-2762.77] is too small to represent as a normalized machine number; precision may be lost.

General

:Exp[-1723.78] is too small to represent as a normalized machine number; precision may be lost.

Using a modified version of the Benedict–Webb–Rubin equation of state, Lee and Kesler [1, 2] generated several tables to estimate the following properties at different reduced pressures and temperatures (

P

r

and

T

r

):

1.

0

Z

and

1

Z

or the compressibility factor

Z=

0

Z

+ω

1

Z

,

2.

0

R

H

R

T

c

and

1

R

H

R

T

c

or the residual enthalpy

R

H

=R

T

c

0

R

H

R

T

c

+ω

1

R

H

R

T

c

,

3.

0

R

S

R

and

1

R

S

R

or the residual entropy

R

S

=R

0

R

S

R

+ω

1

R

S

R

, and

4.

0

ϕ

and

1

ϕ

or the fugacity coefficient

ϕ=

ω

0

ϕ



1

ϕ



.

In the preceding expressions,

ω

and

T

c

are the acentric factor and critical temperature, respectively. These two parameters are set when you select an alkane from the "component" popup menu (from C1 to C10). You can also choose any value for

T

r

and

P

r

. This Demonstration displays all of the cited thermodynamic properties.