Hi all, I'm kind of new here and this is my first post :) I'm a physics UG student now participating in a physics project in my department. In the project I have to make very small air bubbles with radius of a few microns to about 50-100 microns (the exact size doesn't really matter). I have to capture them on the bottom of a dish (like a petri-dish) and the medium that they are in is mainly water (later I will add salts to it). Does anybody have an idea about the procedure to make these kind of bubbles? Thanks for your help!