Vapor pressures and liquid densities for ammonium bromide (NH(4)Br) + ammonia (NH(3)) mixtures were measured over a wide range of temperatures and molalities. Vapor pressures of the NH(4)Br + NH(3) mixtures were measured at temperatures ranging from (303.12 to 373.16) K and molalities ranging Lip to 18.034 mol.kg(-1) of NH(4)Br. Vapor pressures were measured with a static method. The experimental values were correlated With Antoine's equation. Liquid densities of the NH(4)Br + NH(3) mixtures were measured at temperatures ranging from (303.15 to 373.15) K, pressure ranging from (10.0 to 30.0) MPa, and molalities ranging up to 15.171 mol.kg(-1) of NH(4)Br. Liquid densities were measured with a piezometer. The experimental values were cot-related with a Tait-form equation.