Absolute ratings for membranes are based on which pore-size measure?

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Multiple Choice

Absolute ratings for membranes are based on which pore-size measure?

Explanation:
Absolute ratings come from the largest pore opening because any pore that is bigger than the rated size can allow passage of particles of that size. Even if most pores are smaller, a single large pore sets the risk of breakthrough, so the worst-case pore governs the rating. The average or smallest pore size wouldn’t guarantee blocking, and the standard deviation isn’t used to define an absolute rating.

Absolute ratings come from the largest pore opening because any pore that is bigger than the rated size can allow passage of particles of that size. Even if most pores are smaller, a single large pore sets the risk of breakthrough, so the worst-case pore governs the rating. The average or smallest pore size wouldn’t guarantee blocking, and the standard deviation isn’t used to define an absolute rating.

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