Reference Guide

Full Command and Function Reference 3-285
ZFACTOR
Type: Function
Description: Gas Compressibility Z Factor Function: Calculates the gas compressibility correction factor for
non-ideal behavior of a hydrocarbon gas.
x
Tr
is the reduced temperature: the ratio of the actual temperature (T) to the pseudocritical
temperature (T
c
). (Calculate the ratio using absolute temperatures.) x
Tr
must be between 1.05 and
3.0.
y
Pr
is the reduced pressure: the ratio of the actual pressure (P) to the pseudocritical pressure (P
c
).
y
Pr
must be between 0 and 30.
x
Tr
and y
Pr
must be real numbers or unit objects that reduce to dimensionless numbers.
Access: …µ ZFACTOR
Flags: Numerical Results (–3)
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
x
Tr
y
Pr
→
x
Zfactor
x
Tr
'symb'
→
'ZFACTOR(x
Tr
,symb)'
'symb' y
Pr
→
'ZFACTOR(symb,y
Pr
)'
'symb
1
' 'symb
2
'
→
'ZFACTOR(symb
1
,symb
2
)'
ZVOL
Type: Command
Description: Z Volume Coordinates Command: Sets the height of the view volume in the reserved variable
VPAR.
x
low
and x
high
are real numbers that set the z-coordinates for the view volume used in 3D plots.
These values are stored in the reserved variable VPAR.
Access: …µ ZVOL
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
x
low
x
high
→
See also: EYEPT, XVOL, XXRNG, YVOL, YYRNG
^ (Power)
Type: Function
Description: Power Analytic Function: Returns the value of the level 2 object raised to the power of the level 1
object. This can also apply to a square matrix raised to a whole-number power.
If either argument is complex, the result is complex.
The branch cuts and inverse relations for w
z
are determined by this relationship:
w
z
= exp(z(ln w))
Access: Q
Flags: Principal Solution (–1), Numerical Results (–3)