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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
other: Handbook data
Adequacy of study:
key study
Study period:
unkown
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
Method not reported. Handbook data.
GLP compliance:
not specified
Type of method:
other: Handbook data only. No guideline or method is indicated.
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: result extrapolated from series of measurements at higher temperatures

The value is extrapolated from 10 vapour pressure values covering temperatures from 115 to 287.5 °C:

T [°C] VP [mm Hg]
115 1
143.2 5
157 10
174 20
192 40
203 60
217.4 100
240 200
263 400
287.5 760

The Handbook reports 10 different vapour pressures for different temperatures. Based on this temperatures a vapour pressure for 25 °C can be extrpolated:

1 / T [°C]

Log VP

0.00869565

0.00

0.00698324

0.70

0.00636943

1.00

0.00574713

1.30

0.00520833

1.60

0.00492611

1.78

0.00459982

2.00

0.00416667

2.30

0.00380228

2.60

0.00347826

2.88

Based on these values the equation y = -550.58x + 4.5883 can be set (R² =0.9797) and the vapour pressure at 25 °C can be caluclated:

T [°C]

1 / T [°C]

Log VP (extrapolated)

VP (extrapolated) [mm Hg]

20

0.05

-22.9407

1.089E-10

25

0.04

-17.4349

2.680E-08

50

0.02

-6.4233

1.623E-03

The extrapolated vapour pressure of the test item is 2.680E-08 mmHg (=3.57E-06 Pa) at 25 °C.

Conclusions:
The extrapolated vapour pressure of the test item is 2.680E-08 mmHg (=3.57E-06 Pa) at 25 °C.
Executive summary:

The extrapolated vapour pressure of the test item is 2.680E-08 mmHg (=3.57E-06 Pa) at 25 °C.

T [°C] VP [mm Hg]
115 1
143.2 5
157 10
174 20
192 40
203 60
217.4 100
240 200
263 400
287.5 760

The Handbook reports 10 different vapour pressures for different temperatures. Based on this temperatures a vapour pressure for 25 °C can be extrpolated:

1 / T [°C]

Log VP

0.00869565

0.00

0.00698324

0.70

0.00636943

1.00

0.00574713

1.30

0.00520833

1.60

0.00492611

1.78

0.00459982

2.00

0.00416667

2.30

0.00380228

2.60

0.00347826

2.88

Based on these values the equation y = -550.58x + 4.5883 can be set (R² =0.9797) and the vapour pressure at 25 °C can be caluclated:

T [°C]

1 / T [°C]

Log VP (extrapolated)

VP (extrapolated) [mm Hg]

20

0.05

-22.9407

1.089E-10

25

0.04

-17.4349

2.680E-08

50

0.02

-6.4233

1.623E-03

Description of key information

The vapour pressure of the test item is 2.680E-08 mmHg (=3.57E-06 Pa) at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information