ISSN:
1572-9567
Schlagwort(e):
critical exponent
;
critical parameter
;
critical point
;
law of rectilinear diameter
;
refrigerant 502 (R 502)
;
vapor-liquid coexistence curve
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The vapor-liquid coexistence curve for refrigerant 502 (R 502) near the critical point has been determined by visual observation of the disappearance of the meniscus. Twenty-six saturated densities between 262 and 899 kg· m−3 have been obtained within an experimental error in temperature and density of ± 10 mK and ± 0.5%, respectively. Using these results along the vapor-liquid coexistence curve, the critical parameters, i.e., the critical temperature T c =355.37 ±0.01 K and the critical density ρ c =555±3kg · m−3, have been determined based on the disappearance of the meniscus level as well as on the intensity of the critical opalescence. A critical pressure P c =4.070±0.002 MPa has been calculated from the existing vapor-pressure correlation using the present T c value. In addition, the critical exponent β along the coexistence curve and the law of rectilinear diameter near the critical point are discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00505495
Permalink
