# Function Zfactor; Function F0λ; Function Sidens - HP 49g+ User Manual

Graphing calculator.

TINC: temperature increment command
Out of all the functions available in this MENU (UTILITY menu), namely,
ZFACTOR, FANNING, DARCY, F0λ, SIDENS, TDELTA, and TINC, functions
FANNING and DARCY are described in Chapter 6 in the context of solving
equations for pipeline flow. The remaining functions are described following.

## Function ZFACTOR

Function ZFACTOR calculates the gas compressibility correction factor for
nonideal behavior of hydrocarbon gas. The function is called by using
ZFACTOR(x
, y
), where x
is the reduced temperature, i.e., the ratio of actual
T
P
T
temperature to pseudo-critical temperature, and y
is the reduced pressure,
P
i.e., the ratio of the actual pressure to the pseudo-critical pressure. The value
of x
must be between 1.05 and 3.0, while the value of y
must be between 0
T
P
and 30. Example, in ALG mode:
Function F0λ
Function F0λ (T, λ) calculates the fraction (dimensionless) of total black-body
emissive power at temperature T between wavelengths 0 and λ. If no units
are attached to T and λ, it is implied that T is in K and λ in m. Example, in
ALG mode:

### Function SIDENS

3
Function SIDENS(T) calculates the intrinsic density of silicon (in units of 1/cm
)
as a function of temperature T (T in K), for T between 0 and 1685 K. For
example,
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