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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: authoritative handbook
Qualifier:
according to
Guideline:
other: no data
GLP compliance:
no
Temp.:
13.4 °C
Vapour pressure:
1 Pa
Temp.:
33.2 °C
Vapour pressure:
10 Pa
Temp.:
55.9 °C
Vapour pressure:
100 Pa
Key result
Temp.:
25 °C
Vapour pressure:
3.71 Pa
Remarks on result:
other: see 'Remarks'
Remarks:
This value is calculated from the vapour pressure curve (derived from the three values above).
Conclusions:
The vapour pressure was determined at three different temperatures:
13.4 °C 1 Pa
33.2 °C 10 Pa
55.9 °C 100 Pa
Executive summary:

The vapour pressure was determined at three different temperatures:

13.4 °C       1 Pa

33.2 °C       10 Pa

55.9 °C       100 Pa

Plotting this values results in an exponential function with a R-square value of 0.9985. The resultig equation is: f(x) = 0.2481 * e exp(0.1082x) with f(x) = vapour pressure in Pa and x = temperature in °C.

Therefore the vapour pressure at 25 °C is 3.71 Pa.

Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: accepted calculation method
Qualifier:
according to
Guideline:
other: no data
GLP compliance:
no
Key result
Temp.:
25 °C
Vapour pressure:
4.24 Pa
Remarks on result:
other: modified Grain method
Temp.:
25 °C
Vapour pressure:
5.01 Pa
Remarks on result:
other: Antoine method
Conclusions:
The vapour pressure at 25.0 °C was calculated as 4.24 Pa and 5.01 Pa.
Executive summary:

At 25 °C, according to modified Grain method the vapour pressure of 2,5 -xylenol was calculated as 4.24 Pa and according to Antoine method as 5.01 Pa.

Description of key information

At 25 °C, according to modified Grain method the vapour pressure of 2,5 -xylenol was calculated as 4.24 Pa.

Key value for chemical safety assessment

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

Additional information

The vapour pressure was determined at three different temperatures:

13.4 °C       1 Pa

33.2 °C       10 Pa

55.9 °C       100 Pa

Plotting this values results in an exponential function with a R-square value of 0.9985. The resultig equation is: f(x) = 0.2481 * e exp(0.1082x) with f(x) = vapour pressure in Pa and x = temperature in °C.

Therefore the vapour pressure at 25 °C is 3.71 Pa.

The calculated values 4.24 and 5.01 Pa match with the calculated value 3.71 Pa derived from the vapour pressure curve. The R-square value with 4.24 change to 0.9974 and with 5.01 to 0.9927.