The Drop Volume Weight Method

The aim here is to determine the volume V (or weight W) of a drop of liquid (immersed in a second, less-dense liquid) which becomes detached from a vertically mounted capillary tip having a circular cross-section of radius r. The ideal drop weight Wy ji is given by the expression. 

In practice, a weight W is obtained which is less than because a portion of the drop remains attached to the tube tip. Thus, Equation (5.36) should include a correction factor cp, that is a function of the tube radius r and some linear dimension of the drop, that is V /. Thus, 

Values of have been tabulated by Harkins and Brown (12). Lando and 

Oakley [13] used a quadratic equation to fit the correction function to (r/VV ) but a better fit was provided by Wilkinson and Kidwell [14]. 

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