Impermeable
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Example:
Imagine trying to get into a concert without a ticket, only to be stopped at the entrance. This situation is similar to how an impermeable material behaves with water, as it acts like a barrier that prevents water from passing through easily. Just as the concert security ensures that only ticket holders can pass through, an impermeable surface ensures that water cannot penetrate, maintaining a strict boundary.

Practice Version

Impermeable: Does not allow water to pass through easily. Impermeable. In Science, impermeable means a material that does not let liquids, like water, flow through it.