是有算的方法,但是那是用实验数据归纳出经验公式来计算的,其本质仍来源于实验的数据.以下是沸点40-100摄氏度的水对应的压强.(这是美国NIST提供的数据,他们倒的确是研究怎么计算这些数据的,不过他们的计算方法相当的复杂,精度也很高,具体不介绍了)
Temperature (C) → Pressure (kPa)
40 → 7.38
41 → 7.79
42 → 8.21
43 → 8.65
44 → 9.11
45 → 9.59
46 → 10.10
47 → 10.63
48 → 11.18
49 → 11.75
50 → 12.35
51 → 12.98
52 → 13.63
53 → 14.31
54 → 15.02
55 → 15.76
56 → 16.53
57 → 17.34
58 → 18.17
59 → 19.04
60 → 19.95
61 → 20.89
62 → 21.87
63 → 22.88
64 → 23.94
65 → 25.04
66 → 26.18
67 → 27.37
68 → 28.60
69 → 29.88
70 → 31.20
71 → 32.58
72 → 34.00
73 → 35.48
74 → 37.01
75 → 38.60
76 → 40.24
77 → 41.94
78 → 43.70
79 → 45.53
80 → 47.41
81 → 49.37
82 → 51.39
83 → 53.48
84 → 55.64
85 → 57.87
86 → 60.17
87 → 62.56
88 → 65.02
89 → 67.56
90 → 70.18
91 → 72.89
92 → 75.68
93 → 78.57
94 → 81.54
95 → 84.61
96 → 87.77
97 → 91.03
98 → 94.39
99 → 97.85
100 → 101.42