This is an investigation of flow characteristics of a wall jet produced by gases impinging on a plate from an axisymmetric nozzle. Air, hot air, and carbondioxide were used, and the distances from the nozzle to the plate were fixed equal to the nozzle diameters. Experiments were carried out at exit Reynolds numbers from 1300 to 21000, for various nozzle diameters and exit velocities. Velocity, temperature and concentration profiles become similar at various distances X from the impinging center, for the same exit Reynolds number. Experimental relations between X and maximum values of temperature, concentration and velocity were obtained. Mixing length, eddy viscocity and entrainment of surrounding air were given in comparison between impinging and free jets.