(p, rho, T) measurements of liquid ammonia in the temperature range from T=310 K to T=400 K at pressures up to p=17 MPa

Measurements of (p, rho, T) for NH3 at specified temperatures and pressures in the compressed liquid phase were carried out with a metal-bellows varia ble volumometer along 10 isotherms between T = 310 K and T = 400 K at press ures from the vapour pressure to p = 17 MPa. The results cover the high-den sity region from rho = 343 kg . m(-3) to rho = 601 kg . m(-3). The experime ntal uncertainities in temperature T, pressure p, and density rho were esti mated to be less than +/-4 mK, +/-1.0 . 10(-3) . p, and +/-1.0 10(-3). rho, respectively. Measurements of the vapour pressure and saturated liquid den sity at temperatures from T = 310 K to T = 400 K are also reported. On the basis of the present results, the isothermal compressibility and the cubic expansion coefficient are illustrated as a function of temperature and pres sure. (C) 1999 Academic Press.