Vapor Pressure of Water (Handbook of Chemistry and Physics (1992-93))
Temp (oC) |
VP
(kPa) |
|
Temp (oC) |
VP
(kPa) |
|
Temp
(oC) |
VP
(kPa) |
0 |
0.61129 |
|
34 |
5.3229 |
|
67 |
27.347 |
1 |
0.65716 |
|
35 |
5.6267 |
|
68 |
28.576 |
2 |
0.70605 |
|
36 |
5.9453 |
|
69 |
29.852 |
3 |
0.75813 |
|
37 |
6.2795 |
|
70 |
31.176 |
4 |
0.81359 |
|
38 |
6.6398 |
|
71 |
32.549 |
5 |
0.8726 |
|
39 |
6.9969 |
|
72 |
33.972 |
6 |
0.93537 |
|
40 |
7.3814 |
|
73 |
35.448 |
7 |
1.0021 |
|
41 |
7.784 |
|
74 |
36.978 |
8 |
1.073 |
|
42 |
8.2054 |
|
75 |
38.563 |
9 |
1.1482 |
|
43 |
8.6463 |
|
76 |
40.205 |
10 |
1.2281 |
|
44 |
9.1075 |
|
77 |
41.905 |
11 |
1.3129 |
|
45 |
9.5895 |
|
78 |
43.665 |
12 |
1.4027 |
|
46 |
10.094 |
|
79 |
45.487 |
|
13 |
1.4979 |
|
47 |
10.62 |
|
80 |
47.373 |
14 |
1.5988 |
|
48 |
11.171 |
|
81 |
49.324 |
15 |
1.7056 |
|
49 |
11.745 |
|
82 |
51.342 |
16 |
1.8185 |
|
50 |
12.344 |
|
83 |
53.428 |
17 |
1.938 |
|
51 |
12.97 |
|
84 |
55.585 |
18 |
2.0644 |
|
52 |
13.623 |
|
85 |
57.815 |
19 |
2.1978 |
|
53 |
14.303 |
|
86 |
60.119 |
20 |
2.3388 |
|
54 |
15.012 |
|
87 |
62.499 |
21 |
2.4877 |
|
55 |
15.752 |
|
88 |
64.958 |
22 |
2.6447 |
|
56 |
16.522 |
|
89 |
67.496 |
23 |
2.8104 |
|
57 |
17.324 |
|
90 |
70.117 |
24 |
2.985 |
|
58 |
18.159 |
|
91 |
72.823 |
25 |
3.169 |
|
59 |
19.028 |
|
92 |
75.614 |
26 |
3.3629 |
|
60 |
19.932 |
|
93 |
78.494 |
27 |
3.567 |
|
61 |
20.873 |
|
94 |
81.465 |
28 |
3.7818 |
|
62 |
21.851 |
|
95 |
84.529 |
29 |
4.0078 |
|
63 |
22.868 |
|
96 |
87.688 |
30 |
4.2455 |
|
64 |
23.925 |
|
97 |
90.945 |
31 |
4.4953 |
|
65 |
25.022 |
|
98 |
94.301 |
32 |
4.7578 |
|
66 |
26.163 |
|
99 |
97.759 |
33 |
5.0335 |
|
|
|
|
|
|
Suppose
you need to determine the vapor pressure of water at 25.4°C. You know that at
24.0°C the vapor pressure is 2.985 kPa and at 25.0°C it is 3.169 kPa.
1. Determine the difference between the two
pressures: 3.169 - 2.985 = 0.184 kPa.
2. Multiply the difference by the decimal
portion (ONLY!) of the desired temperature: 0.184 x 0.4 = 0.0736 kPa.
3. Add this value to the LOWER pressure you
used in the first step: 2.985 + 0.0736 = 3.0586 kPa.
4. Round off to the appropriate number of
significant figures. In this case, the answer would be 3.059 kPa.