Rheology of Foams Bubble by Bubble

We present rheological measurements of single bubbles, and collections of bubbles to investigate cooperative effects between the bubbles that comprise a foam. For small numbers of monodisperse bubbles we measure the elastic behavior and yield stresses, and make comparisons with polydisperse foams composed of many bubbles. We also present a technique for measuring an ageless foam, where the bubble size and liquid volume fraction remain constant, outside of a microgravity environment.