So for a certain target flow the pressure required to achieve it is used to calculate the pore size, using the Young-Laplace equation as previously explained. When do we consider that the first continuous bubbles are detected? It differs significantly depending on the person.įor that reason the FBP can be defined at different flow rates, e.g. However, this is a visual and, therefore, subjective approach. Then a pressurised gas is applied under the sample and the pressure is gradually increased over time and when a constant flow of rising bubbles is observed on the top side of the sample, it is assumed that the gas pressure has reached bubble point. This is based on the traditional approach of placing the sample in a housing with liquid placed on the top side. The ASTM F-316 standard defines the FBP at the pressure at which the first continuous bubbles are detected. This point corresponds to the largest pore(s) present inside the material. One of the most important parameters measured by a porometer is the first bubble point or FBP.
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