a complex task due to several factors involved in, namely, evaporation, adsorption and the
existence of air bubbles within the system. Nevertheless, the importance of its measurement
is undeniable in equipment such as insulin pumps, or medical drug delivery devices for new-
born, microchip flow pumps, to mention few. The work herein presented was developed in a
partnership between the Volume and Flow Laboratory (LVC) of the Portuguese Institute of …