An estimation of the volumes of the droplets generated during cell sorting
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As based on the litterature I have found, the diameter of the droplets is about 1.89 times the jet diameter. And the jet diameter is 0.866 times the nozzle orifice diameter. You can then calculate for any nozzle orifice a proxy of the diameter of the drops, and thus its volume (assuming a drop is a sphere) : Volume = 4/3 x Pi x radius^3. These calculations come from :
Kachel V, Fellner-Feldegg H, Menke E. Hydrodynamic properties of flow cytometry instruments. In : Melamed MR, Lindmo T, Mendelsohn ML, editors. Flow Cytometry and Sorting, 2nd ed. New York : Wiley ; 1990. pp 27–44.