pinch-off: after entering, antifoam droplets that form lens can bridge the interface creating a capillary insta- bility that destroys the film by “pinching in off”. This phenomenon was first verified for solid dewetting antifoaming particles. For this to occur in an aqueous system, the contact angle between the gas/antifoam droplet/water (hair a=w) must be greater than 90. This contact angle is related to the interfacial tensions, and the condition can be formulated into what is termed by the bridging coefficient (Ba/i > 0). When this coefficient is positive, the contact angle is greater than 90.