Sulphur trioxide

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Guideline:

other: Not reported

Type of method:

other: Not specified

Key result

Temp.:

25 °C

Vapour pressure:

97.3 hPa

Remarks on result:

other: alpha form

Temp.:

25 °C

Vapour pressure:

458.6 hPa

Remarks on result:

other: beta form

Temp.:

25 °C

Vapour pressure:

577.2 hPa

Remarks on result:

other: gamma form

Conclusions:

At 25°C the sulphur trioxide vapour pressure is 97.3 to 577.2 hPa depending on the polymeric form.

Executive summary:

The vapour pressure of sulphur trioxide varies with the polymeric state of the substance. The vapour pressure is 97.3 to 577.2 hPa at 25 °C, depending on the polymeric form.

Description of key information

The vapour pressure of sulphur trioxide varies with the polymeric state of the substance. At 25 °C the vapour pressure is 97.3 to 577.2 hPa depending on the polymeric form.

Key value for chemical safety assessment

Vapour pressure:

9 730 Pa

at the temperature of:

298 K