B. Shirinzadeh and Charles C. Wang, "Accurate determination of the vapor pressure of potassium using
optical absorption," Appl. Opt. 22, 3265-3270 (1983)
The vapor pressure of potassium has been measured in absorption using a cw
tunable laser and calibrated against the accurate radiative lifetime of the
4s—4p doublet of potassium. An accurate
value of 20,850 ± 30 cal/mol for the heat of vaporization (from the liquid
phase) at the melting point was determined.
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Values of the Coefficients α, β, γ, and λ for Potassium
Derived by Fitting Eq. (8) to
the Specific Heat Data of Ref. 3 for
the Range From 250 to 1600 K
T ≤ Tm
T > Tm
α
−2.731
−2.727
β
−2.131 ×
10−2
3.013 ×
10−3
γ
−1.130 ×
10−4
−4.569 ×
10−6
λ
0
1.522 ×
10−9
Table II
Values of the Constants a, b, c, d, and
e for Potassium.a
T ≤ Tm
T > Tm
a
−8.343
−4.316
b
2.734 ×
10−2
3.301 ×
10−3
c
−3.766 ×
10−5
−2.035 ×
10−6
d
−1.146 ×
103
−1.151 ×
103
e
0
3.804 ×
10−10
These constants are derived using Tm = 336.35
K and the values of α, β, γ, and λ given in Table I
Table III
Vapor Pressure Values Calculated from Eq. (9) in the Temperature Range from 240
to 1620 K
T (K)
P (Torr)
T (K)
P (Torr)
240
2.22E − 12
940
4.27E + 02
260
7.01E − 11
960
5.39E + 02
280
1.35E − 09
980
6.74E + 02
300
1.76E − 08
1000
8.35E + 02
320
1.66E − 07
1020
1.02E + 03
340
1.19E − 06
1040
1.25E + 03
360
6.62E − 06
1060
1.51E + 03
380
3.07E − 05
1080
1.82E + 03
400
1.22E − 04
1100
2.17E + 03
420
4.26E − 04
1120
2.57E + 03
440
1.33E − 03
1140
3.03E + 03
460
3.74E − 03
1100
3.55E + 03
480
9.67E − 03
1180
4.14E + 03
500
2.32E − 02
1200
4.80E + 03
520
5.19E − 02
1220
5.54E + 03
540
1.10E − 01
1240
6.36E + 03
560
2.20E − 01
1260
7.27E + 03
580
4.19E − 01
1280
8.28E + 03
600
7.65E − 01
1300
9.40E + 03
620
1.35E − 00
1320
1.06E + 04
640
2.28E + 00
1340
1.20E + 04
660
3.75E + 00
1360
1.34E + 04
680
5.99E + 00
1380
1.50E + 04
700
9.31E + 00
1400
1.67E + 04
720
1.41E + 01
1420
1.86E + 04
740
2.09E + 01
1440
2.06E + 04
760
3.04E + 01
1460
2.28E + 04
780
4.33E + 01
1480
2.51E + 04
800
6.06E + 01
1500
2.76E + 04
820
8.34E + 01
1520
3.02E + 04
840
1.13E + 02
1540
3.31E + 04
860
1.51E + 02
1560
3.61E + 04
880
2.00E + 02
1580
3.93E + 04
900
2.60E + 02
1600
4.27E + 04
920
3.35E + 02
1620
4.63E + 04
Table IV
Comparison of the Vapor Pressure Values of Honig with Those Deduced from
Present Measurements
Values of the Coefficients α, β, γ, and λ for Potassium
Derived by Fitting Eq. (8) to
the Specific Heat Data of Ref. 3 for
the Range From 250 to 1600 K
T ≤ Tm
T > Tm
α
−2.731
−2.727
β
−2.131 ×
10−2
3.013 ×
10−3
γ
−1.130 ×
10−4
−4.569 ×
10−6
λ
0
1.522 ×
10−9
Table II
Values of the Constants a, b, c, d, and
e for Potassium.a
T ≤ Tm
T > Tm
a
−8.343
−4.316
b
2.734 ×
10−2
3.301 ×
10−3
c
−3.766 ×
10−5
−2.035 ×
10−6
d
−1.146 ×
103
−1.151 ×
103
e
0
3.804 ×
10−10
These constants are derived using Tm = 336.35
K and the values of α, β, γ, and λ given in Table I
Table III
Vapor Pressure Values Calculated from Eq. (9) in the Temperature Range from 240
to 1620 K
T (K)
P (Torr)
T (K)
P (Torr)
240
2.22E − 12
940
4.27E + 02
260
7.01E − 11
960
5.39E + 02
280
1.35E − 09
980
6.74E + 02
300
1.76E − 08
1000
8.35E + 02
320
1.66E − 07
1020
1.02E + 03
340
1.19E − 06
1040
1.25E + 03
360
6.62E − 06
1060
1.51E + 03
380
3.07E − 05
1080
1.82E + 03
400
1.22E − 04
1100
2.17E + 03
420
4.26E − 04
1120
2.57E + 03
440
1.33E − 03
1140
3.03E + 03
460
3.74E − 03
1100
3.55E + 03
480
9.67E − 03
1180
4.14E + 03
500
2.32E − 02
1200
4.80E + 03
520
5.19E − 02
1220
5.54E + 03
540
1.10E − 01
1240
6.36E + 03
560
2.20E − 01
1260
7.27E + 03
580
4.19E − 01
1280
8.28E + 03
600
7.65E − 01
1300
9.40E + 03
620
1.35E − 00
1320
1.06E + 04
640
2.28E + 00
1340
1.20E + 04
660
3.75E + 00
1360
1.34E + 04
680
5.99E + 00
1380
1.50E + 04
700
9.31E + 00
1400
1.67E + 04
720
1.41E + 01
1420
1.86E + 04
740
2.09E + 01
1440
2.06E + 04
760
3.04E + 01
1460
2.28E + 04
780
4.33E + 01
1480
2.51E + 04
800
6.06E + 01
1500
2.76E + 04
820
8.34E + 01
1520
3.02E + 04
840
1.13E + 02
1540
3.31E + 04
860
1.51E + 02
1560
3.61E + 04
880
2.00E + 02
1580
3.93E + 04
900
2.60E + 02
1600
4.27E + 04
920
3.35E + 02
1620
4.63E + 04
Table IV
Comparison of the Vapor Pressure Values of Honig with Those Deduced from
Present Measurements