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EC number: 201-204-4 | CAS number: 79-41-4
Vapour pressure
Administrative data
Link to relevant study record(s)
- 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
- 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.
Reference
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
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..
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