exp u2062 7 utilizing expression 7 is convenient in defining the lower limit of a suitable length for the cylindrical capillary tube as set forth in table 1 hereinafter likewise the upper limit is a 4 u2062 p 2 u2062 u03c1 64 u2062 u03b7 2 u2062 p m gt l exp u2062 8 it should be noted that expression 1 can be written utilizing the weber number which is the ratio of the inertia acting on the fluid boundary surface to the boundary surface tension 2 gt we p m u2062 a u03c3 u2062 wherein exp u2062 9 we u03c1 u2062 u2062 a u2062 u2062 u 2 u03c3 exp u2062 10 varying the surface tension and the viscosity coefficient fluid dispensing jobs were carried out to evaluate cylindrical capillary tubes of various sizes the job parameters are set forth in table 1 the capillary tubes employed are products manufactured by efd inc in the united states and are made of stainless steel the u201c 27g u201d u201c 30g u201d and u201c 32g u201d in the u201c gauge u201d column in the table are specifications used by the manufacturer on its products as to the needle bore because dimensional tolerances attend each.