Entrainment of ambient air into sprays produced by a new type of effervescent atomizer is reported. Entrainment data were obtained using a device similar to that described previously. Entrainment data were analyzed using a previous model, together with measured momentum rate data that were also acquired as part of this study. The analysis shows that entrainment by sprays produced using this type of atomizer is predicted to within about 35% by the expression E = m(e)/x root rho(e)M(o), where m(e) is the entrained gas mass flow rate, x is the distance along the spray axis measured from the dispenser exit orifice, rho(c) is the density of the entrained air, M-o is the spray momentum rate at the exit orifice, and E is the experimentally determined entrainment number whose value is 0.15 +/- 0.056 (2 sigma).