permeability

/ˌpɜrmiəˈbɪləti/
noun
  1. The ability of a substance to allow liquids or gases to pass through it.
    • Engineers tested the permeability of the concrete to ensure it would resist water damage.
    • The soil's high permeability allows rainwater to drain quickly.
    • The fabric's permeability makes it ideal for breathable sportswear.
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