�ber die Isothermen einiger Gase bis 400� und ihre Bedeutung f�r das Gasthermometer

Compressibility of Gases at High Temperatures: Ix. Second Virial Coefficients and the Intermolecular Potential of Neon

“…and the contribution due t o the term involving the third virial coefficient can therefore be neglected in equation [3]. I t must be considered, however, in calculating virial data for the 0" and 50°C.…”

Slopes of pv isotherms of He, Ne, A, H2, N2, and O2 at 0 degrees C

“…In the measurements on neon, two different metal containers of the same diameter and wall thickness, but of different lengths, were used; and no corrections were made for the stretch of the containers with pressures up to 100 atmospheres inside and atmospheric pressure outside the containers. The metal containers were also used with nitrogen at temperatures up to 400° C, and measurements [15] were made atO° C and also 100° C with the same pressure inside and outside the container, and also with atmospheric pressure outside. Apparently, the observed differences in volume were considered negligible for their purposes.…”

“…Attention is called to the lack of concordance in the values of v calculated from the relation V=Voo [1 +at+ bt2] given for the volume of the metal container and the value of v actually used in the calculations [15] for the different gases at temperatures above 0 0 C. The metal container, constructed by welding ends on a cylindrical tube, was apparently not annealed before the initial calibration was made by filling with toluene at 18° C. After the container was used in measurements with several different gases at several different temperatures up to 400 0 C, a subsequent calibration [14] with mercury disclosed that the container had shrunk more than 2 in 10 3 • A change in volume of this order of magnitude would make a considerable change in all the a's at 1 atmosphere or the" B-values" calculated from the measurements at various temperatures with He, A, N2, H 2, and a mixture of N e and He. lt seems probable that most of the shrinkage took place during the measurements at the higher temperatures with one of these gases, but the order of the measurements with the different gases is not definitely stated.…”

Application of the corresponding states principle to mixtures of low molecular weight gases at low temperatures and high pressures

“…For gases having any potential in the form of Equation (8) in which the contributions of B"', B'"', . .…”

“…., are significant, substituting Equation ( 1 1 ) and Equation (12) Table 1 and Figure 1. Because of the restriction that Equations (13) and (14) can apply only to substances which have a potential function described by Equation (8) and the same value of h / o d G , it is convenient to have a means of evaluating h / U d x directly from critical constants. This is done by defining a parameter Q as __ where the numerical constant results from combining other constants and has units of (cc./g.…”