Specific heats of fluorine at coexistence

Abstract

Experime ntal s pecific heats of flu orin e at constant total volum e are reported for th e two·phase, liquid·vapor sys tem from triple· to the critical po int. Specific heats of liquid along th e coex istence path are derived by use of PVT data for th e two·phase sys tem , and are re presented by a formul a to faclhtate computations of th ermodynami c properties.

Thermophysical properties of methane: Orthobaric densities and some thermal properties

“…Published data for methane are quite uncertain because the authors failed to give either their experimental observations or a quantitative description of their d erivations [14,15]. The data are shown by figure 5 in The value for expon e nt E was selected by analogy: our oxyge n data yield E = 0.54 by trial , and our fluorine data give E = 0.59 [18]. Present methane data yield …”

The specific heats, Cs, and Cv, of compressed and liquefied methane

“…The versatility of this in strument is demonstrated in that it has been used with very minor modifi cations for the Cv and C(J" measure ments of hydrogen [3,4], oxygen [5 , 6], fluorin e [7,8] , and in this work on me than e. These measureme nts cover tem pe ratures from 14 to 300 K and pressures to 330 bar.…”

“…In the case of the Cu measurement, the two phase heat capacity (liquid and gas) is first determined as the differen ce of the total heat capacit y (DQ/DT, column 6 of table 1) and the empty heat capacity (Co, column 7) an d the result divided by the total amount of sample (C2 , column 8). Then the effects 'of the latent heat of vaporization and heat absorbed by the vapor are subtracted [3,5,7] to give CfT (column 10). This type of correction is derived by Hoge [11] .…”

Measurements of the specific heats, Cs, and Cv, of dense gaseous and liquid ethane

“…The refrigerants used were liquid nitrogen, ice, and cold water. The instrument has been used to measure the specific heats, C σ and C v , of hydrogen [ 4 , 5 ], oxygen [ 6 , 7 ], fluorine [ 8 , 9 ], and methane [ 10 ]. Measurements of the heat of fusion and of the solid-solid transition in ethane with this apparatus have been reported elsewhere [ 11 ].…”

“…The density for each C v measurement is calculated from the filling density after correcting for sample holder expansion and the amount compressed into the filling capillary [ 7 ]. In the case of a C σ measurement the effects of the latent heat of vaporization and heat absorbed by the vapor must be subtracted [ 4 , 6 , 8 ]. This type of correction has been derived by Hoge [ 13 ].…”