Determination of permeability coefficients (K1e K2) in porous materials. The analyses are conducted in a permeameter, using the steady-state airflow method. In the equipment, an air flow is forced to pass through test bodies made with samples and their pressure values are monitored during this process. The results are useful for interpreting diverse phenomena associated with the porous structure of solid materials. In the case of ceramic products, it provides important information regarding the ease of releasing gases, such as water vapor during drying and other gases during sintering.