HP 50g Graphing Calculator - Manual (Page 163)

Page 3-33
ZFACTOR(x
T
, y
P
), where x
T
is the reduced temperature, i.e., the ratio of actual
temperature to pseudo-critical temperature, and y
P
is the reduced pressure, i.e.,
the ratio of the actual pressure to the pseudo-critical pressure. The value of x
T
must be between 1.05 and 3.0, while the value of y
P
must be between 0 and
30. Example, in ALG mode:
Function F0 λ
Function F0 λ (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
Function SIDENS(T) calculates the intrinsic density of silicon (in units of 1/cm
3
)
as a function of temperature T (T in K), for T between 0 and 1685 K. For
example,
Function TDELTA
Function TDELTA(T
0
,T
f
) yields the temperature increment T
f
– T
0
. The result is
returned with the same units as T
0
, if any. Otherwise, it returns simply the
difference in numbers. For example,
The purpose of this function is to facilitate the calculation of temperature
differences given temperatures in different units. Otherwise, it’s simply
calculates a subtraction, e.g.,