Shape and Weight of Liquid Drop

A simple method is to count the number of drops (e.g., 10 or more) and measure the weight (with a very high accuracy less than microgram). 

One may also use a more convenient method where a fluid is pumped and the drops are collected and weighed. Since in some systems (solutions) there may be kinetic effects, one must be careful to keep the flow as slow as possible. This system is very useful in studying systems, which one finds in daily life phenomena oil flow in reservoirs, blood cells flow through arteries. In those cases where the volume of fluid available is limited, one may use this method with advantage. By decreasing the diameters of the tubing, one can work with less than 1 pL fluids. This may be useful in systems such as eye fluids, etc. 

The detachment method is based upon the following to detach a body from the surface of a liquid that wets the body, it is necessary to overcome the same surface tension forces, which operate when a drop is broken away. The liquid attached to the solid surface on detachment creates following surfaces  

Final stage Liquid separated from solid. 

2 Shape of the Liquid Drop (Pendant Drop Method) 

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