Bubble pressure tensiometers

Methods for measuring surface tension must intentionally increase the surface area, typically through pulling or pushing. In the bubble pressure method, this is achieved by creating an air bubble at the tip of a Capillary. All SITA tensiometers operate using this method, ensuring that the measurements are comparable. In this method, the measured dynamic surface tension always depends on the parameter Bubble lifetime tlife, which corresponds to the wetting time or the surface age. The bubble pressure method is classified as a dynamic measurement method. In practical terms, we could say that “this method allows us to measure the surface tension present at the moment the product is used".