Abstract: A process and apparatus for accurately dispensing individual droplets of nonpolar liquid is described. Monodispersed streams of polar and nonpolar liquid droplets are coordinated to intersect and collide at an intersection point. The precollision course of selected polar liquid droplets is altered so as to permit unaltered passage of a corresponding number of nonpolar liquid droplets to continue on their precollision path past the collision point. The process and apparatus has particular utility in such areas as ink jet printing, automatic titration, pharmaceutical and chemical mixing, the study of combustion dynamics, and the dispensing of fusion materials into a nuclear fusion reactor.