Tate cohomology group

The vapour pressure of water is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state. At higher pressures water would condense. The water vapour pressure is the partial pressure of water vapour in any gas mixture in equilibrium with solid or liquid water. As for other substances, water vapour pressure is a function of temperature and can be determined with Clausius–Clapeyron relation.

Approximation formula

The vapour pressure of water may be approximated by the following relations (in order of increasing accuracy):

• $P=\exp \left(20.386-{\frac {5132\,\mathrm {K} }{T}}\right)\,\mathrm {mmHg}$

  where Template:Mvar is the vapour pressure (mmHg) and Template:Mvar is the temperature in kelvin.

• Using the Antoine equation

  $\log _{10}P=A-{\frac {B}{C+T}}$

  where the temperature Template:Mvar is in degrees Celsius and the vapour pressure Template:Mvar is in mmHg. The constants are given as

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Many Singapore property brokers know the developers and you may confirm the goodwill of the agent by asking the developer., °C
Water	8.07131	1730.63	233.426	1	100
Water	8.14019	1810.94	244.485	99	374

Graphical pressure dependency on temperature

Vapour pressure diagrams of water; data taken from Dortmund Data Bank. Graphics shows triple point, critical point and boiling point of water.

Table of water vapour pressures

The following table list water vapour pressure in units of kPa and mmHg as a function of temperature in degrees Celsius.

Temperature (°C)	Vapour pressure (kPa)	Vapour pressure (mmHg)
0	0.6	4.5
3	0.8	6.0
5	0.9	6.8
8	1.1	8.3
10	1.2	9.0
12	1.4	10.5
14	1.6	12.0
16	1.8	13.5
18	2.1	15.8
19	2.2	16.5
20	2.3	17.5
21	2.5	18.7
22	2.6	19.8
23	2.8	21.1
24	3.0	22.4
25	3.2	23.8
26	3.4	25.2
27	3.6	26.7
28	3.8	28.4
29	4.0	30.0
30	4.2	31.5
32	4.8	36.0
35	5.6	42.0
40	7.4	55.5
50	12.3	92.3
60	19.9	149.3
70	31.2	234.1
80	47.3	354.9
90	70.1	525.9
100	101.3	760.0

ITS-90 table

The following table is derived from ITS-90 formulations of water vapour pressure.

ITS-90 Temperature (°C)	Vapour pressure (Pa)
0	611.213
0.01	611.657
2	705.973
4	813.522
6	935.316
8	1072.944
10	1228.139
12	1402.782
14	1598.914
16	1818.747
18	2064.670
20	2339.262
22	2645.302
24	2985.777
26	3363.893
28	3783.090
30	4247.046
32	4759.694
34	5325.230
36	5948.122
38	6633.128
40	7385.299
42	8209.997
44	9112.902
46	10100.025
48	11177.719
50	12352.690
52	13632.007
54	15023.115
56	16533.844
58	18172.420
60	19947.476
62	21868.064
64	23943.660
66	26184.180
68	28599.
70	31201.894
72	34001.191
74	37009.635
76	40239.470
78	43703.430
80	47414.751
82	51387.177
84	55634.969
86	60172.910
88	65016.317
90	70181.042
92	75683.482
94	81540.588
96	87769.863
98	94389.378
99.97436	101325.000
100	101417.770

See also

• Gas laws
• Molar mass
• Goff-Gratch equation

100 degree

References

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Further reading

• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• Murphy, D. M. and Koop, T. (2005): Review of the vapour pressures of ice and supercooled water for atmospheric applications, Quarterly Journal of the Royal Meteorological Society 131(608): 1539–1565. 21 year-old Glazier James Grippo from Edam, enjoys hang gliding, industrial property developers in singapore developers in singapore and camping. Finds the entire world an motivating place we have spent 4 months at Alejandro de Humboldt National Park.

External links

• Web Page listing various vapour pressure equations