A compact form for the analytic description of temperature dependence of saturation vapor pressure over plane surfaces of water and ice
A possibility is studied of extending the range of action of the simple three-parameter formula (ITS-90 scale) proposed in the previous work of the author [2] for the dependence of saturation vapor pressure E on temperature T within the range of 250 to 490 K. The results demonstrated that the depend...
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Veröffentlicht in: | Russian meteorology and hydrology 2017, Vol.42 (1), p.27-37 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A possibility is studied of extending the range of action of the simple three-parameter formula (ITS-90 scale) proposed in the previous work of the author [2] for the dependence of saturation vapor pressure
E
on temperature
T
within the range of 250 to 490 K. The results demonstrated that the dependence ln[
E
(
T
)/
E
(
T
bas
)] = (
T
-
T
bas
)[
A
-
B
(
T
-
T
bas
) +
C
(
T
-
T
bas
)
2
]/
T
with four sets of coefficients
A
,
B
, and
C
obtained using one base temperature Tbas equal to the temperature of triple point of water
T
t
= 273.16 K and two additional base values
T
bas2
= 473.16 K and
T
bas3
= 623.16 K makes it possible to approximate rather accurately the initial experimental and computed data in the temperature range from the point of homogeneous freezing of 235 K to the critical temperature of 647 K for liquid water and from 193 K to
T
t
for ice. A procedure used for obtaining the inverse function
T
(
E
) by solving the third-degree algebraic equation is validated. A hypothesis is proposed for the physical substantiation of additional base points in the form of “a noticeable appearance of dimers at the point
T
bas2
and their 100% concentration at the temperature
T
bas3
.” |
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ISSN: | 1068-3739 1934-8096 |
DOI: | 10.3103/S1068373917010046 |