The Compressibility of, and an Equation of State for Gaseous Isobutane

Abstract

The volumetric behavior of gaseous isobutane from 150° to 300°C and from 1.0 to 8.0 moles per liter has been studied. The constants of the Beattie-Bridgeman equation of state for gaseous isobutane are R=0.08206, A0=16.6037, a=0.11171, B0=0.23540, b=0.07697, c=300×104 in units of normal atmospheres, liters per mole, degrees Kelvin.

Measurements of (p,ρ,T) properties for isobutane in the temperature range from 280 K to 440 K at pressures up to 200 MPa

“…The maximum difference is 0.09% in density at p = 50 MPa, which is enough lower than the expanded uncertainty of the present measurements in density being 0.11%. Table 4 shows a comparison of the (p, q, T) measurements with the literature data [5][6][7][8]. (p, q, T) data by Haynes [7] and Miyamoto et al [8] agree with the present measurements within ±0.06% and ±0.16% in density, respectively.…”

“…(p, q, T) data by Haynes [7] and Miyamoto et al [8] agree with the present measurements within ±0.06% and ±0.16% in density, respectively. The data by Beattie et al [5] and Waxman et al [6] show larger density values than the present ones by 0.17% and 0.19%, respectively. Figures 1 and 2 show relative density deviations of the present measurements from Helmholtz-type equation of state proposed by Miyamoto and Watanabe [11].…”

“…The results are given in table 3. Three density measurements in series 1 and five in series 2 were also carried out at the same conditions of temperature and pressure as the literature values [5][6][7][8] …”

“…Sage and Lacey [2,3] and Morris et al [4] measured total 738 points of (p, q, T) data at T = (294 to 511) K. In higher ranges of temperatures, Beattie et al [5] have obtained 75 points of (p, q, T) data in the temperature range from 423 K to 573 K. Waxman et al [6] have measured 85 points of (p, q, T) data in the temperature range from 378 K to 448 K. Haynes [7] reported total 156 measurements in the temperature range from 120 K to 300 K at pressures up to 35 MPa. Miyamoto et al [8] reported 143 points of (p, q, T) and specific isochoric heat capacities at T = (272 to 408) K at pressures up to 30 MPa.…”

Irradiation Testing of Fuel for the Mark I Core of the Argonne Advanced Research Reactor.

“…The relation between pressure and volume can be determined by the Beattie-Bridgeman equation of state since the constants for K r and Xe are known [ 12]. If the gas volume is expressed in terms of atomic volumes, it is possible to tell at what pressure the atomic volume will be approached.…”