The use of fluid microdrops in engineering and experimental science goes back over a century to the study and use of spray generated aerosols, and the use of aerosol produced microdrops to confirm the predictions of fluid mechanics, atomic theory and chemistry. The ability to generate fluid microdrops with a predetermined size, on demand, with precisely controlled trajectories is a more recent invention dating back only a few decades. Its primary commercial and industrial use today is in the field of inkjet image printing
