penetrability

/ˌpɛnətrəˈbɪləti/
noun
  1. The quality or state of being able to be penetrated or entered.
    • Scientists tested the penetrability of the material to see if it could stop bullets.
    • The penetrability of the soil affects how quickly water drains after rain.
    • The soft rock's high penetrability made it easy to drill through.