Measurements of ( p, ρ, T) for{xNH 3 + (1 −x)H 2 O} at x= (0.8952, 0.8041, 0.6985, 0.5052, and 0.1016) and at specified temperatures and pressures in the compressed liquid phase were carried out with a metal-bellows variable volumometer between T= 310 K and T= 400 K at pressures from the bubble point pressure to p= 17 MPa. The results cover the high-density region from ρ= 556 kg · m −3 atx= 0.8952 to ρ= 960 kg · m −3 at x= 0.1016. The experimental uncertainties at a 95 per cent confidence interval in temperature T, pressure p, density ρ, and mole fraction x were estimated to be less than ±11 mK, ±2.6 kPa, ± 2.1 · 10 −3 · ρ, and ± 1.8 · 10 −3 · x, respectively. Measurements of the bubble point pressure and saturated liquid density at temperatures from 310 K to 400 K are also reported. The bubble point pressures indicate negative deviations from Raoult’s law at all investigated temperatures and the excess molar volumes are negative.