An Optical Approach for the Determination of Droplet Volumes in Nanodispensing

Table 7

Gravimetric measurement of different quantities of drops under constant conditions.

Number of drops	5000	7500	10 000	12 500	15 000
Number of measurements	15	15	15	15	15
Mean value [mg or 𝜇L]	0.72 mg	1.12 mg	1.48 mg	1.85 mg	2.24 mg
Std. deviation	0.0372	0.0373	0.0312	0.0398	0.0319
% Std. deviation	5.2%	3.3%	2.1%	2.2%	1.4%
Visual volume	200 pl	200 pl	200 pl	200 pl	200 pl
Visual/gravimetric ratio	1.40	1.33	1.35	1.35	1.34