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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Limited study summary, no guideline and no GLP.
Qualifier:
no guideline followed
Principles of method if other than guideline:
The vapour pressure was measured by comparative ebulliometry with mercury and water as the reference substances. The critical temperature was determined in the rapid heater, the temperature being measured with a platinum resistance thermometer and the automatic a.c. bridge used in the ebulliometric work. The vapour pressures between 2.8 and 202 kPa (with water as reference) were fitted by equation (temperature range 348 - 481 K). The vapour pressure at 298.15 K was extrapolated from the equation.
GLP compliance:
no
Type of method:
other: comparative ebulliometry
Key result
Temp.:
25 °C
Vapour pressure:
169 Pa

Observed vapour pressures

T/K

p/kPa

T/K

p/kPa

Water as reference

348.11

2.837

410.328

31.339

350.720

3.203

415.986

37.379

353.998

3.723

421.956

44.737

358.381

4.524

428.516

54.140

362.304

5.352

434.217

63.540

366.760

6.460

440.271

74.923

370.870

7.644

446.811

88.998

375.320

9.124

451.822

101.131

379.812

10.854

452.860

103.800

384.401

12.894

458.706

119.891

389.097

15.306

463.979

136.055

393.580

17.945

470.279

157.561

399.500

21.995

476.292

180.479

404.423

25.910

481.422

202.021

Mercury as reference

311.639

0.399

331.502

1.235

314.423

0.473

336.416

1.592

316.675

0.539

341.562

2.057

318.734

0.608

348.248

2.808

320.446

0.672

350.815

3.150

321.988

0.733

354.148

3.724

323.857

0.814

358.542

4.528

325.105

0.873

362.401

5.353
Conclusions:
The vapour pressure is determined to be 169 Pa at 25 °C.
Executive summary:

The vapour pressure was measured by comparative ebulliometry with mercury and water as the reference substances. The critical temperature was determined in the rapid heater, the temperature being measured with a platinum resistance thermometer and the automatic a.c. bridge used in the ebulliometric work. The vapour pressures between 2.8 and 202 kPa (with water as reference) were fitted by equation (temperature range 348 - 481 K). The vapour pressure at 298.15 K was extrapolated from the equation.

The vapour pressure is 169 Pa at 25 ℃.

Description of key information

The vapour pressure is reported to be 169 Pa at 25 ℃.

Key value for chemical safety assessment

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

Additional information

The vapour pressure was measured by comparative ebulliometry with mercury and water as the reference substances. The critical temperature was determined in the rapid heater, the temperature being measured with a platinum resistance thermometer and the automatic a.c. bridge used in the ebulliometric work. The vapour pressures between 2.8 and 202 kPa (with water as reference) were fitted by equation (temperature range 348 - 481 K). The vapour pressure at 298.15 K was extrapolated from the equation. The vapour pressure is 169 Pa at 25 ℃.