2
0
2017
bel
ros
0
journal
Original
Beltramino, G.
Rosso, L.
Smorgon, D.
Fernicola, V.
J. Chem. Thermodyn.
2017
2020-09-29
Vapor pressure measurements over supercooled water in the temperature range from -10^1 C to +10^(-2) degC
An accurate measurement of saturation vapor pressure of supercooled water is a strong challenge in metrology, mainly due to difficulties concerning keeping water at a liquid state at temperatures well below the melting point; thus few experimental data covering limited temperature ranges (down to about 253 K) are reported in literature. For this reason, an investigation of the water vapor supercooled water equilibrium along the saturation line is carried out at Istituto Nazionale di Ricerca Metrologica (INRIM). Measurements cover the temperature range from 261.26 K to 273.25 K, corresponding to a saturation vapor pressure from about 244 Pa to 611 Pa. The experimental apparatus includes a borosilicate glass sample cell, kept in a liquid bath at a constant temperature with millikelvin stability and connected to a manifold where the pressure is measured using a capacitive diaphragm pressure gauge. In this work, the water sample preparation, the measuring method and measurement corrections are reported; moreover, a comparison between experimental and literature data is conducted along with the most used vapor pressure formulations. Measurement results are discussed and uncertainty sources estimated. The resulting expanded relative uncertainty (k = 2) varies from 0.085% at 261.26 K to 0.039% at 273.25 K.
Supercooled water-water vapor equilibrium
Clapeyron equation
Saturation vapor pressure
Static measurements method
Water properties
10.1016/j.jct.2016.10.003
105
159-164
1
InChI=1S/H2O/h1H2
XLYOFNOQVPJJNP-UHFFFAOYSA-N
water
H2O
1
Commercial source
1
De-gassed by freezing and melting in vacuum
2
99.8
3
Estimated by the compiler
1
1
1
Principal objective of the work
AB
TRC
4/2/2017
1
Vapor or sublimation pressure, kPa
Closed cell (Static) method
Metastable liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Metastable liquid
Gas
1
Temperature, K
Metastable liquid
1
261.255
6
1
0.2462
4
1
0.00021
1
262.254
6
1
0.2667
4
1
0.000212
1
263.251
6
1
0.2886
4
1
0.000214
1
264.246
6
1
0.3122
4
1
0.000216
1
265.25
6
1
0.3376
4
1
0.000218
1
266.248
6
1
0.3647
4
1
0.00022
1
267.24
6
1
0.3937
4
1
0.000223
1
268.242
6
1
0.4247
4
1
0.000227
1
269.242
6
1
0.458
4
1
0.000231
1
270.25
6
1
0.4939
4
1
0.000235
1
271.248
6
1
0.5318
4
1
0.000238
1
272.248
6
1
0.5724
4
1
0.000239
1
273.251
6
1
0.6158
4
1
0.000239