Permeability Concrete 44 Testing 35 Porous materials 8 Mathematical models 7 Polymers 6 Strength and testing 6 Food 4 Packaging 4 Sealing (Technology) 4 Additives 3 Building materials 3 Dampness in buildings 3 Design and construction 3 Fluid dynamics 3 Mass transfer 3 Moisture 3 Plastics in packaging 3 Cement 2 Clay soils 2 Convection 2 Electronic packaging 2 Electronics 2 Engineered barrier systems (Waste disposal) 2 Expansion joints 2 Fibrous composites 2 Fly ash 2 Heat 2 Hydraulic machinery 2 Hydrocarbon reservoirs 2