👉 Non-permeability is a property of materials that prevents water from passing through them. This means that a material's resistance to water flow is very low, which makes it difficult for water to move past or enter the material. In other words, if a material has high permeability, it can hold more water than it allows, and vice versa. Non-permeable materials are often used in applications where water cannot flow through them, such as in pipes, channels, and soil.
