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Encyclopedia > Vapour pressure of water

Vapour pressure of water can be used in many experiments, particularly experiments relating to gases. A common classroom experiment in which the vapour pressure at various temperatures table is used is when trying to find the molar mass of butane. The experiment is done by releasing butane gas from a cigarette lighter underwater into glass tubing. By calculating the partial pressure of the gas and subtracting the atmospheric pressure on the day that the experiment was conducted, it is possible to obtain an accurate result. This can be done with other gases with the same process.

## Vapour pressure of water at various temperatures GA_googleFillSlot("encyclopedia_square");

Temperature (°C) Pressure (kPa)
0 0.61
1 0.66
2 0.71
3 0.76
4 0.81
5 0.87
6 0.93
7 1.00
8 1.07
9 1.15
10 1.23
11 1.31
12 1.40
13 1.50
14 1.60
15 1.70
16 1.82
17 1.94
18 2.06
19 2.20
20 2.34
21 2.49
22 2.64
23 2.81
24 2.98
25 3.17
26 3.36
27 3.56
28 3.78
29 4.00
30 4.24
31 4.49
32 4.75
33 5.03
34 5.32
35 5.62
36 5.94
37 6.27
38 6.62
39 6.99
40 7.37

The vapor pressure is the pressure (if the vapor is mixed with other gases, the partial pressure) of a vapor. ... It has been suggested that this article or section be merged with steam. ... The gas laws are a set of laws that describe the relationship between thermodynamic temperature (T), pressure (P) and volume (V) of gases. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ...

## References

• Garnett, Pat; Anderton, John D; Garnett, Pamela J (1997) Chemistry Laboratory Manual For Senior Secondary School. Longman. ISBN 0582867649.

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