The design, construction, and testing of a new Knudsen effusion apparatus

• Type: Article in International Scientific Journal
• Date: 2006

Authors

da Silva, MAVR (Author) FCUP; Monte, MJS (Author) FCUP; Santos, LMNBF (Author) FCUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 38

Pages: 778-787

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 213 Citations

Scopus - 224 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-004-KFS

DOI: 10.1016/j.jct.2005.08.013

Abstract (EN): A new Knudsen effusion apparatus, enabling the simultaneous operation of nine effusion cells at three different temperatures, is fully described. The performance of the new apparatus was checked by measuring the vapour pressures, between 0.1 Pa and 1 Pa, over ca. 20 K temperature intervals of benzoic acid, phenanthrene, anthracene, benzanthrone, and 1,3,5-triphenylbenzene. The derived standard molar enthalpies of sublimation are in excellent agreement with the mean of the literature values available for these five compounds and with the recommended values for four of them.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10