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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
according to guideline
Guideline:
other: not known
GLP compliance:
no
Type of method:
other: original data quoted in several reliable data collections
Specific details on test material used for the study:
Origin not known, purity typically >= 98 %
Key result
Temp.:
20 °C
Vapour pressure:
0.97 hPa
Remarks on result:
other: calculated using the Clausius-Clapeyron equation; VP=e^-6303.1*1/temp+21.186; temp = 20 °C = 293.15 K

P (mmHg)    T (°C)
1           25.5
5           48.5
10          60
20          72.7
40          86.4
60          95.3
100         106.6
200         123.0
400         142.5
760         161

converted to 20°C according Clausius Clapeyron: 0.97 hPa

Conclusions:
The vapor pressure of methacrylic acidvcalculated by Clausius Clapeyron method based on published data of a vapor pressure curve is 0.97 hPa at 20°C.
Executive summary:

The vapour pressure of methacrylic acid was calculated by Clausius Clapeyron method based on published data of a vapor pressure curve (data collection by Stull, 1947). The calculated value is 0.97 hPa at 20 °C.

Description of key information

The vapour pressure of methacrylic acid was calculated by Clausius Clapeyron method based on published data of a vapor pressure curve (data collection by Stull, 1947). The calculated value based on measured data is 0.97 hPa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
0.97 hPa
at the temperature of:
20 °C

Additional information

Data of another vapor pressure curve are available by Kirk-Othmer (1981). Based on these data a vapor pressure of 0.335 hPa at 20 °C has been calculated.

Supporting information is available in a valid handbook which reported the vapour pressure of methacrylic acid with 0.87 hPa at 20 °C..